clk: renesas: r9a07g044: Add M4 Clock support

Add support for M4 clock which is sourced from pll2_533_div2.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20220430114156.6260-8-biju.das.jz@bp.renesas.com


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