tests: drivers: uart: Add gpio_loopback harness to test config #31188
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Added gpio_loopback to indicate that test requires pins to be
shorten. This allows to filter out tests on setup which does
not have pin setup.
Until #30578 is resolved this help to prevent these tests from running on hardware without pin setup.
Signed-off-by: Krzysztof Chruscinski [email protected]