x86: galileo: Convert to use CONFIG_DM_USB

Move to driver model for USB on Intel Galileo.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/configs/galileo_defconfig b/configs/galileo_defconfig
index 59306a9..d05154e 100644
--- a/configs/galileo_defconfig
+++ b/configs/galileo_defconfig
@@ -16,5 +16,7 @@
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_DM_PCI=y
 CONFIG_DM_RTC=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
 CONFIG_USE_PRIVATE_LIBGCC=y
 CONFIG_SYS_VSNPRINTF=y