arm64: dts: rockchip: Update sdhci alias for rock-5a

In the previous version, the sdhci alias was set to mmc1: an artifact
leftover from the port from vendor kernel. Update the alias to mmc0 to
match the device's boot order.

Fixes: a4a8f1afb360 ("arm64: dts: rockchip: Add rock-5a board")
Signed-off-by: Christopher Obbard <chris.obbard@collabora.com>
Link: https://lore.kernel.org/r/20230110195352.272360-2-chris.obbard@collabora.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>