arch/arm64/boot/dts/marvell: add optee FW definitions

commit df3b2b988e6b7ac8f88f50f78b2a45990da0c6ac from
git@git.assembla.com:cavium/WindRiver.linux.git

Add reserved memory and ARM firmware definitions for optee
memory region in Marvell Armada SoCs to avoid protected memory
access.

Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Change-Id: I42028e550fa4bfb70701c4298efa88e8f4be8d8e
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/90259


Reviewed-by: Stefan Chulski <stefanc@marvell.com>
Tested-by: Stefan Chulski <stefanc@marvell.com>
Signed-off-by: Beniamin Sandu <beniamin.sandu@windriver.com>