media: amphion: implement vpu core communication based on mailbox

driver use mailbox to communicate with vpu core.
and there are a command buffer and a message buffer.
driver will write commands to the command buffer,
then trigger a vpu core interrupt
vpu core will write messages to the message buffer,
then trigger a cpu interrupt.

Signed-off-by: Ming Qian <[email protected]>
Signed-off-by: Shijie Qin <[email protected]>
Signed-off-by: Zhou Peng <[email protected]>
Reported-by: kernel test robot <[email protected]>
Tested-by: Nicolas Dufresne <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

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