Codec2 decoders: Invalidate allocated graphic buffer in stop()

Bug: 243583691
Test: atest CtsMediaV2TestCases -- --module-arg \
CtsMediaV2TestCases:instrumentation-arg:codec-prefix:=c2.android.

Change-Id: I312c106350b2eb072f0e6f2f9a83f16eb8424cb2
(cherry picked from commit 05575b11d336e40ba9bf8406347df1bdc5e673ab)
Merged-In: I312c106350b2eb072f0e6f2f9a83f16eb8424cb2
4 files changed