Don't send brightness to car service inside Emulator

This fixes this cts test: android.cts.statsd.atom.UidAtomTests#testScreenBrightness

Bug: 139959479
Test: atest android.cts.statsd.atom.UidAtomTests#testScreenBrightness
Change-Id: I66f858ce7686a90cd395f4e646133e8ea4604be4
Merged-In: I66f858ce7686a90cd395f4e646133e8ea4604be4
(cherry picked from commit 1322465c48d0c3dfa5953573b80a89460b8e7e95)
2 files changed