Simplify the uSDHC4 eMMC controller setup. This is the only eMMC present on the system and only controller that is used, so drop the extra logic. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Fabio Estevam <fabio.estevam@nxp.com> Cc: Silvio Fricke <silvio.fricke@softing.com> Cc: Stefano Babic <sbabic@denx.de> Reviewed-by: Stefano Babic <sbabic@denx.de>