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>
diff --git a/configs/r8a7795_salvator-x_defconfig b/configs/r8a7795_salvator-x_defconfig
index 6a411e3..0cb1d8a 100644
--- a/configs/r8a7795_salvator-x_defconfig
+++ b/configs/r8a7795_salvator-x_defconfig
@@ -35,6 +35,9 @@
 CONFIG_PHY_MICREL_KSZ90X1=y
 CONFIG_DM_ETH=y
 CONFIG_RENESAS_RAVB=y
+CONFIG_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_DM_REGULATOR_GPIO=y
 CONFIG_SCIF_CONSOLE=y
 CONFIG_USB=y
 CONFIG_DM_USB=y