Bluetooth: MGMT: Use BIT macro when defining bitfields

[ Upstream commit a80d2c54 ]

This makes use of BIT macro when defining bitfields which makes it
clearer what bit it is toggling.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Stable-dep-of: 73f55453 ("Bluetooth: MGMT: Fix marking SCAN_RSP as not connectable")
Signed-off-by: Sasha Levin <sashal@kernel.org>