common/cnxk: add mbox request and response definitions

common/cnxk: add mbox request and response definitions

The admin function driver sits in Linux kernel as mailbox
server. The DPDK AF mailbox client, send the message to mailbox
server to complete the administrative task such as get mac
address.

This patch adds mailbox request and response definition of
existing mailbox defined between AF driver and DPDK driver.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Nithin Dabilpuram <ndabilpuram@marvell.com>
Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Signed-off-by: Kiran Kumar K <kirankumark@marvell.com>
Signed-off-by: Harman Kalra <hkalra@marvell.com>
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Signed-off-by: Satha Rao <skoteshwar@marvell.com>
Signed-off-by: Shijith Thotton <sthotton@marvell.com>