arm64: dts: ls1046a: support SD UHS-I and eMMC HS200 on RDB

This patch is to enable SD UHS-I mode and eMMC HS200 mode on
LS1046ARDB in dts. Also, the eSDHC peripheral clock must be used
instead of platform clock to support these modes.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>