m7-common: Remove FM radio flag

* m7vzw doesn't support FM radio, move flag to m7

Change-Id: I707128aad6b23a1fb06544d21b3945eee28fedfc

BoardConfigCommon.mk

@@ -58,9 +58,6 @@ BOARD_BOOTIMAGE_PARTITION_SIZE := 16777216
 BOARD_FLASH_BLOCK_SIZE := 131072
 BOARD_RECOVERYIMAGE_PARTITION_SIZE := 16776704
 
-# FM
-AUDIO_FEATURE_ENABLED_FM_POWER_OPT := true
-
 # General compilation flags
 TARGET_SPECIFIC_HEADER_PATH += device/htc/m7-common/include