nusb/kb: add quirks for Elecom HUGE trackball

nusb/kb: add quirks for Elecom HUGE trackball

As said in the code comment:

	Elecom trackball report descriptor lies by
	omission, failing to mention all its buttons.
	We patch the descriptor with a correct count
	which lets us parse full reports. Tested with:
		Elecom HUGE (M-HT1DRBK, M-HT1URBK)

The descriptor fixup is adapted from Linux kernel:
	drivers/hid/hid-elecom.c
in which a more detailed account of why and how this
works may be found.

A followup change to nusb/kb will be needed to expose
these additional events for potential remapping.