mm-video-v4l2: vdec: handle_extradata: map/unmap buffer everytime

Buffer address present on drv_ctx.ptr_outputbuffer will become
invalid with the arrival of more buffer with new fds. So instead
of relying on this field map the output buffer fd everytime while
handling extradata.

CRs-Fixed: 1021773
Change-Id: I0f4245953bcf35e89b9c84a4b5d5ae9cbc34da2e
2 files changed