ARM: dts: renesas: Remove 'reg-io-width' properties from MMCIF nodes

ARM: dts: renesas: Remove 'reg-io-width' properties from MMCIF nodes

The driver does not use this property and all upstream SoCs use the same
value anyhow. Remove it and get rid of a lot of dtbs_check warnings.
Tested with a Lager (R-Car H2) board and with the soon to be added
Genmai (RZA1) MMCIF support.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20240925150904.3582-2-wsa+renesas@sang-engineering.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>