dm: mmc: fsl_esdhc: handle vqmmc supply

dm: mmc: fsl_esdhc: handle vqmmc supply

Handle vqmmc supply. Some boards have a fixed I/O voltage
at 1.8V for emmc, so the usdhc also needs to be configured
as 1.8V by setting VSELECT bit. The vs18_enable is the one
that used to checking whether setting VSELECT or not in
the driver. So if vqmmc supply is 1.8V, set vs18_enable,
the driver will set VSELECT.

Signed-off-by: Peng Fan <[email protected]>
Cc: Jaehoon Chung <[email protected]>
Cc: York Sun <[email protected]>
Cc: Stefano Babic <[email protected]>
Reviewed-by: Jaehoon Chung <[email protected]>