C2 Decoders: Move copy/convert functions to SimpleC2Component

VPx, AV1 and mpeg4 decoders had few copy/convert functions to
write data to graphic buffers from codec buffers.
These functions are now moved to SimpleC2Component.

Also added function to support conversion to P010 format for
10 bit YUV data.

Bug: 178229371
Test: atest CtsMediaV2TestCases -- --module-arg \
 CtsMediaV2TestCases:instrumentation-arg:codec-prefix:=c2.android.

Change-Id: Iec78a67f95bb514967403eb478ecf8e0f0a8fbf9