arm64: zynqmp: Introduce kria SOM defconfig

Enable the initial kria SOM specific configurations like pinctrl,
pinconf etc. Also add the environment file.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Link: https://lore.kernel.org/r/20231109042407.6123-1-venkatesh.abbarapu@amd.com


Signed-off-by: Michal Simek <michal.simek@amd.com>