LF-5607 imx8mm: vpu_enc: correctly recover encoder status when power resume

commit  24d480934be20a38f3423bcbdfd05e3ecfc3d669 from
https://github.com/nxp-imx/linux-imx

 lf-6.1.y

Rewrite mirror_regs to hw_regs only in encoding finished(irq_status & 0x04),
also need to clear 'reg_corrupt'.

Signed-off-by: Shijie Qin <shijie.qin@nxp.com>
Reviewed-by: ming_qian <ming.qian@nxp.com>
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>