kmod-usb-phy-qcom-dwc3 is required to get USB working on ipq806x. It was
missed in previous commit so let's enable it automatically.
Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45345 3c298f89-4303-0410-b956-a3cf2f4a3e73