Fix build: Don't build GCam for non-arm targets

Bug: 10430748

Change-Id: I26e1208b38f40808ff59e3976f5c4a76efa15b4c
diff --git a/Android.mk b/Android.mk
index 285e595..0aeee74 100644
--- a/Android.mk
+++ b/Android.mk
@@ -10,6 +10,7 @@
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_SRC_FILES += $(call all-java-files-under, src_pd)
+LOCAL_SRC_FILES += $(call all-java-files-under, src_pd_gcam)
 
 LOCAL_RESOURCE_DIR += $(LOCAL_PATH)/res