octeontx2-af: fix REE boundary graph check

commit 4d8089f0eddda432e282647b9732a7180e670cf9 from
git@git.assembla.com:cavium/WindRiver.linux.git

the offset holds memory range (up to 128MB) while the check was
referring to the graph max entries (16M), the fix is multiply
the graph max entries (16M) with the entry size (8B).

Signed-off-by: Meir Levi <mlevi4@marvell.com>
Change-Id: I9e1a86c4cac8f06e5e1f169d76a84232b99094ba
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/69932
Tested-by: sa_ip-sw-jenkins <sa_ip-sw-jenkins@marvell.com>
Reviewed-by: Liron Himi <lironh@marvell.com>
Reviewed-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
(cherry picked from commit 09fe0d8a74a3ae55622faf6987d351ba300540ca)
Reviewed-on: https://sj1git1.cavium.com/c/IP/SW/kernel/linux/+/70021
Signed-off-by: Ruiqiang Hao <Ruiqiang.Hao@windriver.com>