qcom bsp will handle xtra/agps/ni/time through
qcom propreitary service, and non-qcom bsp will handle
xtra/gps/ni/time through android framework.
xtra url will be queried from modem on qcom bsp,
and read from gps.conf from non-qcom bsp.
Change-Id: Ib54a1596caa65f7aa0358f639640c3d1074980e7
In order to prevent the issue where the xtra server url
that stored in gps.conf is incorrect (like xtra.bin instead
of xtra2.bin) for a particular modem, I've made this change
so that the xtra server url can be queried through loc api.
CRs-fixed: 366599
Change-Id: If65de98d837f068fd61a235cbf1104026246e5a9
