Fix PeripheralRef soundness issue allowing &T. #2919
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Fix soundness issue introduced in a previous soundness fix #2602 . PeripheralRef must not implement DerefMut itself, but the blanket impl must still require DerefMut. Otherwise you can create two instances of a driver on the same uart by using `&my_uart`.
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Fix soundness issue introduced in a previous soundness fix #2602 .
PeripheralRef must not implement DerefMut itself, but the blanket impl must still require DerefMut. Otherwise
you can create two instances of a driver on the same uart by using
&my_uart.