drivers: firmware: octeontx2: 9X platform support for memtest

commit cf78ef7f1f7bc01672d6b4c402cfe76dfc04caea from
git@git.assembla.com:cavium/WindRiver.linux.git

This change is to support memtest on cn9xx platform.

Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
Change-Id: Ie73c7f402e22d5d779743876135479ff29fc031e
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/93021
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/120335
Reviewed-by: Chandrakala Chavva <cchavva@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>