Camera: Address an issue that the invalid memory is accessed

If the ImagePlanes is initiailized the HardwareBuffer and is close()'ed
by finalizer then the invalid memory access to the GraphicBufferWrapper
and GraphicBuffer could be happen.

This patch addressed the issue by properly clearing fields after
being destoyed.

Bug: 283038375
Test: Test extensions proxy service with advanced extender
implementation while maintaining a reference counter so that the
ExtensionImage is finalized without invoking close.

Change-Id: Iab49da708daf0099d029cda6873cb2e811377fbc