imx: mx7dsabresd: switch to DM USB

Switch to use DM USB.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/configs/mx7dsabresd_defconfig b/configs/mx7dsabresd_defconfig
index 0c9fa7c..52faae4 100644
--- a/configs/mx7dsabresd_defconfig
+++ b/configs/mx7dsabresd_defconfig
@@ -59,6 +59,7 @@
 CONFIG_DM_SPI=y
 CONFIG_SOFT_SPI=y
 CONFIG_USB=y
+CONFIG_DM_USB=y
 CONFIG_USB_EHCI_HCD=y
 CONFIG_MXC_USB_OTG_HACTIVE=y
 CONFIG_USB_STORAGE=y