Koen Zandberg ddb22a3c56
sam0_common: Use Single-cycle I/O Port for GPIO when available
The Cortex-m0 based ATSAM devices can use the Single-cycle I/O Port for
GPIO. This commit modifies the gpio_t type to use this port when
available. It is mapped back to the peripheral memory space for
configuration access.  When it is not available, the _port_iobus() and
_port() functions behave identical, which is the case for the samd51.
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