soc: marvell: otx2: Add Kconfig option for otx2-ghes-init file.

commit 89234c6558feb2431cc06b74dc5aae34ba8b204e from
git@git.assembla.com:cavium/WindRiver.linux.git

Add Kconfig to enable ghes support on ARM64 platforms only.

Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
Change-Id: Ia8b65dc4aa0d8aabe3f204b33d7e4c8c058371b1
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/114997


Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Chandrakala Chavva <cchavva@marvell.com>
(cherry picked from commit 2bd62a287003f705c21efe0d9832a5cb103d098b)
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/115286


Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>