On Surface Book 2 it is not possible to archive stable S0ix while bluetooth is
enabled but no device is connected. Either S0ix fails completely, or the
residency is pretty bad. When bluetooth is disabled, or a device such as the pen
is connected, S0ix works fine and residency is great again.
By disabling bluetooth when no device is connected, we get proper S0ix in all
situations. And since no device is connected, the reset won't really matter.
Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>