LF-7236-3: imx8m: vpu: don't return EPOLLERR if qbuf isn't called

commit  59c918207256ffd7e7fd3a4aeddb92e3eb6aa0a2 from
https://github.com/nxp-imx/linux-imx lf-6.1.y

disable quirk_poll_must_check_waiting_for_buffers,
this quirk check only affect capture queue,
and it's set by V4L2 for backwards compatibility reasons.

But it's not used for m2m device, the vpu decoder is
m2m device, but not implement using m2m helper function.

just keep consistent with the m2m implementation

Signed-off-by: Ming Qian <ming.qian@nxp.com>
Tested-by: xiahong.bao <xiahong.bao@nxp.com>
Reviewed-by: TaoJiang <tao.jiang_2@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>