librpc: Move librpc from the discontinued msm7k repo

This is still a dep for building GPS on older hardware

Change-Id: Ib413d44463d9b217b4346a073125ecf823856e7d

Conflicts:

	loc_api/libloc_api-rpc-50001/libloc_api-rpc-glue/Android.mk
msm7x30: build librpc

Change-Id: I4a426e16fe94d834a95dd8b3460265b56dc4257c