[riot-notifications] [RIOT-OS/RIOT] drivers/periph/uart: add uart_write_byte() & uart_write_string() functions (#15499)

[benpicco]

@benpicco pushed 2 commits.

0d3b1195c5324a768f85ef8b770d6c04a5e7c326  cpu/sam0_common: uart: implement uart_write_byte()
a153a16cc605858bdce87f911dec40000dabe1d3  cpu/sam0_common: uart: drop TX pin check on every write()


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View it on GitHub:
https://github.com/RIOT-OS/RIOT/pull/15499/files/dda5e79e1f5e7e00c589f84081394adeb6d8aef8..a153a16cc605858bdce87f911dec40000dabe1d3
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