arm64: dts: ls1012a: add eSDHC nodes

There are two eSDHC controllers in LS1012A. This patch is to add
eSDHC nodes for ls1012a dts. Also enable eSDHC for RDB/QDS boards.

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