linux-firmware: mediatek: add MT7622 Bluetooth firmwares and license file

Add MT7622 Bluetooth firmware files, along with the corresponding MediaTek
license file.
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>

LICENCE.mediatek

+MediaTek Inc. grants permission to use and redistribute aforementioned firmware
+files for the use with devices containing MediaTek chipsets, but not as part of
+the Linux kernel or in any other form which would require these files themselves
+to be covered by the terms of the GNU General Public License or the GNU Lesser
+General Public License.
+
+These firmware files are distributed in the hope that they will be useful, but
+are provided WITHOUT ANY WARRANTY, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTY
+OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

WHENCE

@@ -3901,6 +3901,15 @@ OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 
 --------------------------------------------------------------------------
 
+Driver: btmtk - MediaTek Bluetooth Driver
+
+File: mediatek/mt7622pr2h.bin
+Version: 20180621204904
+
+Licence: Redistributable. See LICENCE.mediatek for details.
+
+--------------------------------------------------------------------------
+
 Driver: rk3399-dptx - ROCKCHIP rk3399 dptx firmware
 
 File: rockchip/dptx.bin