arm64: dts: renesas: Disable SD functions for plain eMMC

Some SDHI instances are solely used for eMMC. Disable SD and SDIO
for faster initialization.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: Adam Ford <aford173@gmail.com> (beacon)
Link: https://lore.kernel.org/r/20210119133322.87289-1-wsa+renesas@sang-engineering.com


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