Handle return code from BMA driver, and set a flag is the initialization fails. This allows to boot InfiniTime even if the device cannot initialize.

src/components/motion/MotionController.cpp

@@ -31,3 +31,6 @@ bool MotionController::ShouldWakeUp(bool isSleeping) {
   }
   return false;
 }
+void MotionController::IsSensorOk(bool isOk) {
+  isSensorOk = isOk;
+}