Add support for PMOD_MTU3 macro to enable MTU3 node on RZ/{G2,V2}L SMARC
EVK.

The MTU3a PWM pins are muxed with spi1 pins and counter external input
phase clock pins are muxed with scif2 pins. Disable these IPs when
PMOD_MTU3 macro is enabled.

Apart from this, the counter Z phase clock signal is muxed with the
SDHI1 cd signal. So disable SDHI1 IP, when the counter Z phase signal
is enabled.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20230706153047.368993-1-biju.das.jz@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>