Bluetooth: MAINTAINERS: add Devicetree bindings to Bluetooth drivers

The Devicetree bindings should be picked up by subsystem maintainers,
but respective pattern for Bluetooth drivers was missing.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -3613,6 +3613,7 @@ S:	Supported
 W:	http://www.bluez.org/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth.git
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git
+F:	Documentation/devicetree/bindings/net/bluetooth/
 F:	drivers/bluetooth/
 BLUETOOTH SUBSYSTEM