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atmega: fix the Pro Mini uart_echo examples - #1082
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Follow-up to #1074.
arduino-pro_mini_5v_uart_echowas built for the Nano target; it now usespro_mini_5v.arduino-pro_mini_3v3_uart_echo. 115200 isn't reachable at 8 MHz (it's a compile error), souart_echonow uses 57600 on every board (-0.79% error at 16 MHz, +2.12% at 8 MHz).Tested on an 8 MHz Pro Mini (3.3 V) through a CH340G adapter.