Add bcm43xx-3wire-variant patch

Add patches for Raspberry Pi support:

bcm43xx-Add-bcm43xx-3wire-variant.patch
bcm43xx-The-UART-speed-must-be-reset-after-the-firmw.patch
Increase-firmware-load-timeout-to-30s.patch
Move-the-43xx-firmware-into-lib-firmware.patch

Source:
https://gist.github.com/pelwell/c8230c48ea24698527cd

Further information:
https://patchwork.kernel.org/project/bluetooth/patch/20201218190609.107898-2-dave.jones@canonical.com/#23855853
https://www.raspberrypi.org/forums/viewtopic.php?t=176348

Signed-off-by: Re4son 3520622-re4son@users.noreply.gitlab.com