tests: drivers: gpio: add overlay to run test on IFX kit_psc3m5_evk

Adds an overlay to enable the GPIO api tests to run on the
kit_psc3m5_evk board. GPIO 3.0 is used as an output, 3.1 is used as an
input for the test.  The test expects GPIO 3.0 and GPIO 3.1 to be
jumpered together.

Signed-off-by: John Batch <john.batch@infineon.com>