common/octeontx2: add mbox request and response definition

common/octeontx2: add mbox request and response definition

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: Vamsi Attunuru <vattunuru@marvell.com>
Signed-off-by: Vivek Sharma <viveksharma@marvell.com>
Signed-off-by: Harman Kalra <hkalra@marvell.com>
Signed-off-by: Sunil Kumar Kori <skori@marvell.com>
Signed-off-by: Krzysztof Kanas <kkanas@marvell.com>
Signed-off-by: Zyta Szpak <zyta@marvell.com>