defconfig: Enable USB PHY drivers for Bengal

Enable USB PHY drivers to support USB in Highspeed
and Superspeed mode on Bengal.
Also, enable drivers to support USB device and host
mode features.

Change-Id: Ib8a337c647a209512d0277ce220cfc0c098e3bb8
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>