x86: qemu: Convert to use driver model usb

Move to driver model for USB on QEMU.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

configs/qemu-x86_defconfig

@@ -19,6 +19,8 @@ CONFIG_NETDEVICES=y
 CONFIG_E1000=y
 CONFIG_DM_PCI=y
 CONFIG_DM_RTC=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
 CONFIG_VIDEO_VESA=y
 CONFIG_FRAMEBUFFER_SET_VESA_MODE=y
 CONFIG_FRAMEBUFFER_VESA_MODE_111=y