Fix cache by userId bugs

Three bugs were present here:

1) isLocationEnabled() will return incorrect results for USER_CURRENT
and USER_CURRENT_OR_SELF
2) Disabling the location enabled cache does not work properly in the
system process, we only disable the cache for a single instance of
LocationManager.
3) isLocationEnabled() was not respecting the user as defined by the
context used to create the LocationManager.

Bug: 185401689
Test: atest CtsLocationFineTestCases
Change-Id: I84bff02604a4b2d84494a0e099e172c4ffb400a2