HID: bpf: move the BIT() macro to hid_bpf_helpers.h

This macro can be useful in mopre than one place

Link: https://gitlab.freedesktop.org/libevdev/udev-hid-bpf/-/commit/7970a9c17aa0756bad63e89fccb6ee4f2ec83ccc


Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Link: https://patch.msgid.link/20240627-import-bpf-v1-3-0dbcda4a5b1f@kernel.org


Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>