Bluetooth: Add __init and __exit marks to UART drivers

Those marks are useful to save space in the binary and in the memory.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

diff --cc drivers/bluetooth/hci_ath.c
Simple merge

diff --cc drivers/bluetooth/hci_bcsp.c
Simple merge

diff --cc drivers/bluetooth/hci_h4.c
Simple merge

diff --cc drivers/bluetooth/hci_ll.c
Simple merge