feat(driver): autodetect IMU, add support for SC7U22 (#7191)

Co-authored-by: raphaelcoeffic <1050031+raphaelcoeffic@users.noreply.github.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

radio/src/mixer.cpp

@@ -386,10 +386,10 @@ getvalue_t _getValue(mixsrc_t i, bool* valid)
 
 #if defined(IMU)
   else if (i == MIXSRC_TILT_X) {
-    return gyro.scaledX();
+    return gyroScaledX();
   }
   else if (i == MIXSRC_TILT_Y) {
-    return gyro.scaledY();
+    return gyroScaledY();
   }
 #endif