c2-codecs: clear pts maps when context is deleted

Orignal Change:
https://android-review.googlesource.com/c/device/generic/goldfish-opengl/+/1722390

otherwise, it will interfer with next decoding
session.

Bug: 189234097

test:
atest android.mediav2.cts.CodecDecoderSurfaceTest#testFlushNative

Change-Id: I8ee4b851eeed651145b15e2ca1f4d608dd08e724
Merged-In: I8ee4b851eeed651145b15e2ca1f4d608dd08e724
1 file changed