Rename EmulatedUserHal to FakeUserHal.

EmulatedUserHal is a library that allows setting and getting fake
user HAL properties, and has nothing to do with emulator. So we
rename it to FakeUserHal to be clearer.

Test: Local build.
Bug: 194340549
Change-Id: I29bf3ceb9e4cacb0a1da96699bd4ba843cab883d