configs: am65x_evm_r5: enable driver for fixed regulators

Some of the regulators we need to successfully boot are fixed
regulators. Enable the driver to properly probe them.

Tested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Bryan Brattlof <bb@ti.com>
Reviewed-by: Nishanth Menon <nm@ti.com>
diff --git a/configs/am65x_evm_r5_defconfig b/configs/am65x_evm_r5_defconfig
index b2f1e72..b892f2e 100644
--- a/configs/am65x_evm_r5_defconfig
+++ b/configs/am65x_evm_r5_defconfig
@@ -118,6 +118,8 @@
 CONFIG_TI_SCI_POWER_DOMAIN=y
 CONFIG_DM_REGULATOR=y
 CONFIG_SPL_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_FIXED=y
+CONFIG_SPL_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y
 CONFIG_SPL_DM_REGULATOR_GPIO=y
 CONFIG_DM_REGULATOR_TPS62360=y