HID: bpf: Fix NKRO on Mistel MD770

Mistel MD770 keyboard (using Holtek Semiconductor, Inc. controller) has a quirk in report descriptor in one of its interfaces (more detail in the source file). Fix up the descriptor to allow NKRO to work again.

Tested by loading the BPF program and confirming that 8 simultaneous keypresses work.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=218495