Use BOARD_HAVE_QCOM_FM flag

* Prevent parsing any subdirectory files unless BOARD_HAVE_QCOM_FM is
  enabled.

Change-Id: I7f4995b882bac3a6380026eaab2dedd57b5bb5b8
diff --git a/Android.mk b/Android.mk
index 67b0366..7bcb560 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,3 +1,5 @@
+ifeq ($(BOARD_HAVE_QCOM_FM),true)
+
 LOCAL_PATH:= $(call my-dir)
 LOCAL_DIR_PATH:= $(call my-dir)
 
@@ -10,3 +12,5 @@
 
 LOCAL_PATH := $(LOCAL_DIR_PATH)
 include $(LOCAL_PATH)/helium/Android.mk
+
+endif # BOARD_HAVE_QCOM_FM