arm64: defconfig: enable MUSB HDRC along with Allwinner glue

Allwinner SoCs typically have a Mentor Graphics Inventra MUSB
dual role controller for USB OTG. This is need for verifying
gadget functions, so enable them by default.

Tested 'otg' mode with mass storage function.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>