Bluetooth: btusb: Add flag to define wideband speech capability

[ Upstream commit 3e4e3f73 ]

This change adds a new flag to define a controller's wideband speech
capability.  This is required since no reliable over HCI mechanism
exists to query the controller and driver's compatibility with
wideband speech.

Signed-off-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Stable-dep-of: da06ff1f ("Bluetooth: btusb: Add 0bda:b85b for Fn-Link RTL8852BE")
Signed-off-by: Sasha Levin <sashal@kernel.org>