drivers: soc: cn10k: Add support for retrieving firmware boot logs

commit 1f6b20123d405a6be9d098f4656589171831fcd1 from
git@git.assembla.com:cavium/WindRiver.linux.git

Change-Id: I7484d434701aace36f33b5b245c27b262b93e987
Signed-off-by: Jayanthi Annadurai <jannadurai@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/56759
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Chandrakala Chavva <cchavva@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>