soc: add info to identify the am62p SoC family

Include the part number for TI's am62px family of SoCs so we can
properly identify it during boot

Reviewed-by: Igor Opaniuk <igor.opaniuk@foundries.io>
Reviewed-by: Neha Malcom Francis <n-francis@ti.com>
Signed-off-by: Bryan Brattlof <bb@ti.com>