Follow-up to OpenIPC/firmware#2370, which moves `usb-mode`,
`uvc-gadget-setup` and `S72usbmode` into a selectable `usb-dual-role`
package. Nothing about them was device-specific; they were only here because
this is where the OTG image was first put together.
So this profile stops carrying its own copies and selects the package instead.
Keeping both would be worse than untidy: firmware installs them in /usr/sbin
and this profile installed them in /usr/bin, so a build with both would put two
versions of each script on the camera and let PATH order decide which ran --
with the copy here being the older, missing the bus settling, the UDC guard and
the idempotent apply that came with the move.
MERGE AFTER the firmware change, not before: until that lands there is no
package to select, and a build from this branch ships no role scripts at all.
What stays here is what is genuinely particular to this board: the defconfig,
the kernel config, and the dwc3/uvc patches.
