arm64: dts: renesas: rzg2lc-smarc-som: Enable OSTM

Enable OSTM{1, 2} interfaces on RZ/G2LC SMARC EVK.
OSTM0 is reserved for TF-A.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220307192436.13237-3-biju.das.jz@bp.renesas.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>