Disable caching during HeadsetPhoneStateTest

Mocking of telephony services causes issues with client-side caches, so
we disable caching during HeadsetPhoneStateTest.
Bug: 151953109
Test: atest HeadsetPhoneStateTest

Merged-In: I73b6325a7ea355218c61e279e9b2ca60edc29ac8
Change-Id: I73b6325a7ea355218c61e279e9b2ca60edc29ac8
1 file changed