Fix GPS building

build/core/base_rules.mk:130: *** hardware/qcom/gps/loc_api/libloc_api-rpc:
MODULE.TARGET.STATIC_LIBRARIES.libloc_api-rpc already defined by
device/samsung/msm7x27-common/loc_api/libloc_api-rpc.  Stop.

Change-Id: I741fe6a1a238924cc59cc667781e94dfe33acf90