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.h

@@ -14,13 +14,16 @@ namespace Pinetime {
       uint32_t NbSteps() const { return nbSteps; }
       bool ShouldWakeUp(bool isSleeping);
 
-      private:
+      void IsSensorOk(bool isOk);
+      bool IsSensorOk() const { return isSensorOk; }
+
+    private:
       uint32_t nbSteps;
       int16_t x;
       int16_t y;
       int16_t z;
       int16_t lastYForWakeUp = 0;
-
+      bool isSensorOk = false;
     };
   }
 }