ARM: omap3_beagle: Enable DM_PMIC and DM_REGULATOR

Enabling DM_PMIC, DM_REGULATOR_FIXED, and DM_REGULATOR_GPIO
gives us the ability to better monitor voltages and enable
hardware through the device tree. The TL4030 (TPS65950) is
not yet migrated to DM, so this patch only enables the fixed
and GPIO controlled regulators.

Based on commit [1][2].

[1] a40d3cc845756e1e38af5ac31986539417e64abb
[2] 2448e42d73fb91e4b56bb41b2677e18ab99a6c83

Signed-off-by: Romain Naour <romain.naour@gmail.com>
diff --git a/configs/omap3_beagle_defconfig b/configs/omap3_beagle_defconfig
index a9b2c15..c7111f4 100644
--- a/configs/omap3_beagle_defconfig
+++ b/configs/omap3_beagle_defconfig
@@ -85,6 +85,11 @@
 CONFIG_DM_ETH=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_SINGLE=y
+CONFIG_DM_PMIC=y
+# CONFIG_SPL_PMIC_CHILDREN is not set
+CONFIG_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_DM_REGULATOR_GPIO=y
 CONFIG_SPI=y
 CONFIG_DM_SPI=y
 CONFIG_OMAP3_SPI=y