ARM: defconfig: kp_imx53: Enable DM_USB support on HSC|DDC boards

This commit enables the DM_USB on HSC|DDC i.MX53 based boards.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/configs/kp_imx53_defconfig b/configs/kp_imx53_defconfig
index 4be67d1..45227c2 100644
--- a/configs/kp_imx53_defconfig
+++ b/configs/kp_imx53_defconfig
@@ -40,6 +40,7 @@
 CONFIG_PINCTRL_IMX5=y
 # CONFIG_SPL_PMIC_CHILDREN is not set
 CONFIG_DM_PMIC_MC34708=y
+CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_SPECIFY_CONSOLE_INDEX=y
 CONFIG_CONS_INDEX=2
 CONFIG_MXC_UART=y