HID: bpf: add in-tree HID-BPF fix for the XBox Elite 2 over Bluetooth

When using the XBox Wireless Controller Elite 2 over Bluetooth,
the device exports the paddle on the back of the device as a single
bitfield value of usage "Assign Selection".

The kernel doesn't process those usages properly and report KEY_UNKNOWN
for it.

SDL doesn't know how to interprete that KEY_UNKNOWN and thus ignores the
paddles.

Given that over USB the kernel uses BTN_TRIGGER_HAPPY[5-8], we
can tweak the report descriptor to make the kernel interprete it properly:
- we need an application collection of gamepad (so we have to close the
  current Consumer Control one)
- we need to change the usage to be buttons from 0x15 to 0x18

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Peter Hutterer <[email protected]>
Signed-off-by: Benjamin Tissoires <[email protected]>

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