Configs for RZ/G2L

Hi All,

This MR is for testing purpose only and should be only merged when the corresponding linux patches [0] have been merged into 5.10-cip kernel.

[0] https://patchwork.kernel.org/project/cip-dev/cover/20211229101530.22783-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers, Prabhakar