tests: drivers: gpio: gpio_basic_api: add ke17z overlay file

Add frdm_ke17z_fgpio.overlay to add fgpio configuration, and
add update testcase.yml to add FGPIO driver test for frdm_ke17z
and frdm_ke17z512 platforms.
Updated ke17z512 gpio test pins to avoid conflicts with I2C pin.

Signed-off-by: Anke Xiao <anke.xiao@nxp.com>