drivers: versal: mailbox communication

Mailbox driver to communicate with the PLM firmware executing on the
Microblaze processor.

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Acked-by: J

drivers: versal: mailbox communication

Mailbox driver to communicate with the PLM firmware executing on the
Microblaze processor.

Signed-off-by: Jorge Ramirez-Ortiz <jorge@foundries.io>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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