msm_vidc: support eof flag for fbd

Currently eof flag from firmware fbd is not handled,
modify to propagate eof flag from firmware to v4l2_buf,
this is needed to support eof flag for only last slice
of frame in slice delivery mode.

CRs-Fixed: 2141262
Change-Id: If8fa888af2af9f895f9d1f3546d74b11b917d5fd
Signed-off-by: Qiwei Liu <qiweil@codeaurora.org>