test gpio_basic_api: Enable for nrf52_bsim

Add DT and kconfig overlays for the nrf52_bsim so this test can be run
in this board too.
This simulated board supports short-circuiting pins
either programmatically or thru configuration files,
but it does not support a pull in an input being able to drag
a non driven output, so we need to skip the pull test.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>