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Add shadow register for UBRRH to keep it separate from UCSRC #309

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Add shadow register for UBRRH to keep it separate from UCSRC #309

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Commits on Oct 27, 2018

  1. Add shadow register for UBRRH to keep it separate from UCSRC 

    In e.g. ATmega8 UBRRH and UCSRC registers share the same I/O location.
Bit URSEL decides in which physical register written data should go.
As there are now more registers then I/O locations, "shadow" versions of
certain regbit functions that store to a pointer ("shadow register")
instead of the main registers in avr->data[] were introduced.
UBRRH was moved into a shadow register, while UCSRC stays a regular register.
Therefore, writes to UBRRH/UCSRC with URSEL bit set do not set the baudrate
falsely anymore.
    @StefanKrupop
    StefanKrupop committed Oct 27, 2018
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