arm: mach-k3: j7200: Fix firewall warnings at boot time

J721E and J7200 have same file j721e_init.c which had the firewall
configs for J721E being applied on J7200 causing the warnings. Split the
firewalls for both the boards to remove those warnings.

Signed-off-by: Manorit Chawdhry <m-chawdhry@ti.com>