ipa: rpi: Fix incorrect cast for ExposureTime ControlInfo
controls::ExposureTime is of type ControlTypeInteger32, but the
default ControlInfoMap casts a value to int64_t causing incorrect
initialisation of the associated ControlInfo.
Fix this by casting correctly to int32_t.
Fixes: 8cebd777c ("ipa: rpi: Apply default ControlInfo values for sensor controls (2)")
Signed-off-by: Naushir Patuck <[email protected]>