configs: trats2: enable the max77686 regulator config

Enable the CONFIG_DM_REGULATOR_MAX77686 for using regulator driver.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/configs/trats2_defconfig b/configs/trats2_defconfig
index f270fc9..93aa211 100644
--- a/configs/trats2_defconfig
+++ b/configs/trats2_defconfig
@@ -37,6 +37,8 @@
 CONFIG_MMC_SDHCI_S5P=y
 CONFIG_DM_PMIC=y
 CONFIG_DM_PMIC_MAX77686=y
+CONFIG_DM_REGULATOR=y
+CONFIG_DM_REGULATOR_MAX77686=y
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_GADGET=y