uboot-imx

ARM: rmobile: Enable DM regulator support

Regulators are needed for the MMC framework to let it toggle the SD power.
Enable DM regulator support and support for fixed and GPIO regulator.

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