Make sanitizeLocationInfo System Api.

sanitizeLocationInfo is a helper API but it's used by TelephonyRegistry
which is not part of mainline module. So we need to expose it as System
Api, and properly rename it.

Bug: 146905502
Test: build flash and boot
Change-Id: Ia318ada2e478dbb24349119203b7869d23342ee5
Merged-In: Ia318ada2e478dbb24349119203b7869d23342ee5