MLK-13440-4 warp: Replace CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT by using vs18_enable parameter

Change to use the new way to set the vs18_enable field to 1 for fixed 1.8v I/O eMMC.
Don't use CONFIG_SYS_FSL_ESDHC_FORCE_VSELECT any longer.

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit c1bf2d97)