uboot-imx

ARM: rmobile: Remove SD clock configuration from board files

The configuration is now fully performed by the SD and clk drivers,
so remove it from the board file.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>