plat-k3: drivers: Add support for TI mailbox driver

New devices like the AM62L use a mailbox to communicate with the
security firmware. Add mailbox driver here to support the mailbox
hardware.

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plat-k3: drivers: Add support for TI mailbox driver

New devices like the AM62L use a mailbox to communicate with the
security firmware. Add mailbox driver here to support the mailbox
hardware.

Signed-off-by: Aniket Sarkar <a-sarkar1@ti.com>
Signed-off-by: Suhaas Joshi <s-joshi@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>

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