Delete mcu HAL.

This HAL was intended to support doze mode but it is currently
unused and it's best for it to stay that way.

Bug: 16516536
Change-Id: I4f442e27d68f18ff322afd4c1debd2f392687e80
diff --git a/modules/Android.mk b/modules/Android.mk
index c903eee..0725d3e 100644
--- a/modules/Android.mk
+++ b/modules/Android.mk
@@ -1,4 +1,4 @@
 hardware_modules := gralloc hwcomposer audio nfc nfc-nci local_time \
 	power usbaudio audio_remote_submix camera consumerir sensors vibrator \
-	mcu tv_input fingerprint
+	tv_input fingerprint
 include $(call all-named-subdir-makefiles,$(hardware_modules))