ARM: imx_v6_v7_defconfig: enable more USB configurations

- USB test module
- USB gadget functions using configfs which are just ready within
  several release cycles.
- USB audio gadget
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -276,6 +276,7 @@ CONFIG_USB_SERIAL=m
 CONFIG_USB_SERIAL_GENERIC=y
 CONFIG_USB_SERIAL_FTDI_SIO=m
 CONFIG_USB_SERIAL_OPTION=m
+CONFIG_USB_TEST=m
 CONFIG_USB_EHSET_TEST_FIXTURE=m
 CONFIG_NOP_USB_XCEIV=y
 CONFIG_USB_MXS_PHY=y
@@ -293,7 +294,14 @@ CONFIG_USB_CONFIGFS_EEM=y
 CONFIG_USB_CONFIGFS_MASS_STORAGE=y
 CONFIG_USB_CONFIGFS_F_LB_SS=y
 CONFIG_USB_CONFIGFS_F_FS=y
+CONFIG_USB_CONFIGFS_F_UAC1=y
+CONFIG_USB_CONFIGFS_F_UAC2=y
+CONFIG_USB_CONFIGFS_F_MIDI=y
+CONFIG_USB_CONFIGFS_F_HID=y
+CONFIG_USB_CONFIGFS_F_UVC=y
+CONFIG_USB_CONFIGFS_F_PRINTER=y
 CONFIG_USB_ZERO=m
+CONFIG_USB_AUDIO=m
 CONFIG_USB_ETH=m
 CONFIG_USB_G_NCM=m
 CONFIG_USB_GADGETFS=m