arm64: versal: Add SelectMAP boot mode identification

The SelectMAP configuration interface provides an 8-bit,
16-bit or 32-bit bidirectional data bus interface to the Versal FPGA
configuration logic that can be used for both configuration and readback.

A connected microcontoller to the SelectMAP interface can load boot
image with bitstream, TF-A (ARM Trusted Firmware) and U-Boot.

This commit adds the missing identification of the SelectMAP mode.

Signed-off-by: Polak, Leszek <LPolak@arri.de>
Reviewed-by: Stefan Roese <sr@denx.de>
Cc: Michal Simek <michal.simek@amd.com>
Cc: Stefan Roese <sr@denx.de>
Link: https://lore.kernel.org/r/DU0PR07MB8419F7765892CDBCE7D559C5C8CFA@DU0PR07MB8419.eurprd07.prod.outlook.com


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