AP_ExternalControl: Only enable external control when DDS is enabled

[Ryanf55]

Purpose

Only enable external control when it's needed by DDS. We don't want AP_ExternalControl taking up flash unless it's going to be called from an external interface.

Details

• AP_DDS: External Control enable #28429 (comment)
• AP_DDS: Copter takeoff service #26911 (comment)

[peterbarker]

Board                    AP_Periph  blimp  bootloader  copter  heli  iofirmware  plane  rover  sub
CubeBlack                           *      *           -448    -392              -168   -304   *
CubeOrange-periph-heavy  *                                                                     
CubeOrangePlus                      *      *           -360    -400              -168   -288   *
CubeRedPrimary                      *      *           -376    -384              -168   -344   *
Durandal                            *      *           -400    -392              -168   -304   *
Hitec-Airspeed           *                                                                     
KakuteH7-bdshot                     *      *           -392    -376              -160   -288   *
MatekF405                           -24    *           -528    -584              -264   -384   -24
Pixhawk1-1M-bdshot                  -24                -576    -552              -272   -400   -24
f103-QiotekPeriph        *                                                                     
f303-Universal           *                                                                     
iomcu                                                                *                         
revo-mini                           -24    *           -584    -592              -272   -392   -24
skyviper-journey                                       -568                                    
skyviper-v2450                                         -472                                    

So... that's good....

Thanks!

[Ryanf55]

Board                    AP_Periph  blimp  bootloader  copter  heli  iofirmware  plane  rover  sub
CubeBlack                           *      *           -448    -392              -168   -304   *
CubeOrange-periph-heavy  *                                                                     
CubeOrangePlus                      *      *           -360    -400              -168   -288   *
CubeRedPrimary                      *      *           -376    -384              -168   -344   *
Durandal                            *      *           -400    -392              -168   -304   *
Hitec-Airspeed           *                                                                     
KakuteH7-bdshot                     *      *           -392    -376              -160   -288   *
MatekF405                           -24    *           -528    -584              -264   -384   -24
Pixhawk1-1M-bdshot                  -24                -576    -552              -272   -400   -24
f103-QiotekPeriph        *                                                                     
f303-Universal           *                                                                     
iomcu                                                                *                         
revo-mini                           -24    *           -584    -592              -272   -392   -24
skyviper-journey                                       -568                                    
skyviper-v2450                                         -472                                    

So... that's good....

Thanks!

Yea, sorry about letting all this slip through the cracks earlier. This should resolve it:)

[Ryanf55]

Blocked by #28651 (comment)