https://redmine.rock-chips.com/issues/379038
When the reg_offset ioctl is not set the first time decoding will get
error on translate the pps buffer fd in kernel.
So we must set the MPP_FLAGS_REG_OFFSET_ALONE on each message.
Signed-off-by: Herman Chen <herman.chen@rock-chips.com>
Change-Id: I67f8413047adc77ca3addfe8dbed28ab1b0bcea8