Add Wear TEST_MAPPING for MctsMediaV2TestCases

This change adds CodecEncoderSurfaceTest, AdaptivePlaybackTest and
CodecEncoderTest of MctsMediaV2TestCases to TEST_MAPPING.

Bug: 409175986
Test: Build
Flag: TEST_ONLY
(cherry picked from https://partner-android-review.googlesource.com/q/commit:b64e66ec44e953baba28a771632ea2b9f86bf7d2)
Merged-In: I417819c27cf0df91e347a7ab91452f7ec8adea4c
Change-Id: I417819c27cf0df91e347a7ab91452f7ec8adea4c