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Benjamin Valentin e1f84de6c5 cpu/sam0_common: UART: simplify init sequence
We don't need to read-modify-write the CTRLA register to disable
the UART.
The entire CTRLA register is re-written just a few lines below, so
we can just set it to 0 to disable the UART.

There is also no need to reset the UART since we re-write all config
registers in init.
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