ARM: dts: vfxxx: Include support for esdhc0 functionality.

Extend the existing Vybrid eSDHC devicetree implementation to also
describe the esdhc0 functional block.

Tested on a custom VF610-based board with a Toshiba THGBM1G5D2EBAI7 eMMC
module attached to esdhc0.

Signed-off-by: Cory Tusar <cory.tusar@pid1solutions.com>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>