Revert "Add rule to convert WIFI_FEATURE_IMU_DETECTION"

This reverts commit fdcf16f55c1b7642bbdab02fc997a8295cd91d41.

Reason for revert: Variable belongs internally

Change-Id: I3af8968f36f68bed34f40c921608582b1798ca65
diff --git a/core/board_config_wifi.mk b/core/board_config_wifi.mk
index 3c27d59..8289bf2 100644
--- a/core/board_config_wifi.mk
+++ b/core/board_config_wifi.mk
@@ -80,7 +80,4 @@
 endif
 ifeq ($(strip $(TARGET_USES_AOSP_FOR_WLAN)),true)
     $(call soong_config_set,wifi,target_uses_aosp_for_wlan,true)
-endif
-ifdef WIFI_FEATURE_IMU_DETECTION
-    $(call soong_config_set,wifi,feature_imu_detection,$(WIFI_FEATURE_IMU_DETECTION))
-endif
+endif
\ No newline at end of file