tests/extmod: Support esp32,mimxrt,stm32,samd ports in UART TX test.

Getting this test running on stm32- and mimxrt-based boards requires adding
a small delay after constructing the UART so that the initial idle frame
has time to be transmitted before the test starts.

Also, the timing margin needs to account for an additional 1-bit worth of
time on some MCUs.

Thanks to @robert-hh for the esp32, mimxrt and samd settings.

Signed-off-by: Damien George <damien@micropython.org>

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