AP_Airspeed: don't send AIRSPEED_AUTOCAL message when disabled #44604

Job	Run time
build (stm32f7, chibios, 10)	3m 58s
build (stm32h7, chibios, 10)	3m 19s
build (fmuv2-plane, chibios, 10)	1m 44s
build (periph-build, chibios, 10)	3m 41s
build (iofirmware, chibios, 10)	1m 33s
build (CubeOrange-bootloader, chibios, 10)	48s
build (fmuv3-bootloader, chibios, 10)	46s
build (revo-bootloader, chibios, 10)	53s
build (stm32h7-debug, chibios, 10)	2m 22s
build (fmuv3, chibios, 10)	5m 32s
build (revo-mini, chibios, 10)	4m 15s
build (MatekF405-Wing, chibios, 10)	4m 51s
build (CubeOrange-ODID, chibios, 10)	2m 27s
build (CubeRedPrimary-bootloader, chibios, 10)	47s
build (configure-all, chibios, 10)	11m 10s
build (build-options-defaults-test, chibios, 10)	7m 4s
build (signing, chibios, 10)	2m 55s
build (CubeOrange-PPP, chibios, 10)	2m 2s
build (CubeRed-EKF2, chibios, 10)	2m 18s
build (SOHW, chibios, 10)	3m 35s
build (Pixhawk6X-PPPGW, chibios, 10)	1m 9s
build (new-check, chibios, 10)	4m 15s
	1h 11m 24s

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