drivers: amd: Add PS GPIO Support

Add PS GPIO Driver support for AMD Platforms.

The PS GPIO Controller is managed through the PS subsystem and
can operate in either the Secure World or the Non-Secu

drivers: amd: Add PS GPIO Support

Add PS GPIO Driver support for AMD Platforms.

The PS GPIO Controller is managed through the PS subsystem and
can operate in either the Secure World or the Non-Secure World.
The driver utilizes the Device Tree Blob (DTB) to determine whether the
PS GPIO Controller should be supported in the Secure World.

Signed-off-by: Akshay Belsare <akshay.belsare@amd.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>
Acked-by: Jorge Ramirez-Ortiz <jorge@foundries.io>

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