Bluetooth: btusb: Fine-tune mt7663 mechanism.

[ Upstream commit 48c13301 ]

Fine-tune read register for mt7663/mt7921.
For mediatek chip spcific wmt protocol, we add more delay to send EP0
In-Token.

Signed-off-by: Mark Chen <Mark-YW.Chen@mediatek.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Stable-dep-of: fd3f1066 ("Bluetooth: btusb: mediatek: fix WMT failure during runtime suspend")
Signed-off-by: Sasha Levin <sashal@kernel.org>