C2SoftAmrWbDec: Fix reset while codec's stop().

Bug: 147348711
Test: atest android.mediav2.cts.CodecDecoderTest
Test: atest android.mediav2.cts.CodecDecoderSurfaceTest

Change-Id: Ibc3a8b5b25691d2226414143e63e4736226ef0af
Merged-In: Ibc3a8b5b25691d2226414143e63e4736226ef0af
1 file changed