rockchip: rk3308: add support for sdmmc boot

Some ROCK Pi S SKU/models are not equipped with SD-NAND (eMMC),
therefore SPL needs access to sdmmc: add it to rk3308-u-boot.dtsi
with bootph-all property.

Signed-off-by: Massimo Pegorer <massimo.pegorer@vimar.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
2 files changed