linux-phytec-fsl

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>