Use qcom path macros

Change-Id: I050522c8806fcc1b302f7e6b43d1e8270c62d394
gps: Use project pathmap

 * Include if either BOARD_USES_QCOM_HARDWARE is not set or if the
   GPS variant matches.

Change-Id: I21d0cd47f09ee2ab4d63c1717b4513c521e890d7
gps: Expect build system to always have a default QCOM variant

Change-Id: Iafe2243b335e67b3a719484dc2faf0fa5ef01651