Remove sensor_initialisation.c's dependency on mw.h/board.h.

Extracted sensor alignment variables to sensorAlignmentConfig

This commit marks the end of the sensor dependency cleanup.

src/sensors_common.h

@@ -26,4 +26,10 @@ typedef enum {
     CW270_DEG_FLIP = 8
 } sensor_align_e;
 
+typedef struct sensorAlignmentConfig_s {
+    sensor_align_e gyro_align;              // gyro alignment
+    sensor_align_e acc_align;               // acc alignment
+    sensor_align_e mag_align;               // mag alignment
+} sensorAlignmentConfig_t;
+
 extern int16_t heading;