GNSS_CFLAGS included in pla module cannot be included by all the
modules. Define it in build/target_specific_features.mk to make it
included by the whole project.
Change-Id: Ib13c43a65ecd14a7a97050dd80b4dce6aa8ad339
CRs-fixed: 2168176
Implementation of LocationAPI into gps hal
to be a common API that is called into by platform
specific APIs.
Change-Id: Ie5a7bd217d4ae2175ad49e6aca2fb6ecd4702f3b
CRs-fixed: 1112712