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>
diff --git a/board/xilinx/versal-net/board.c b/board/xilinx/versal-net/board.c
index c18be0c..990ca16 100644
--- a/board/xilinx/versal-net/board.c
+++ b/board/xilinx/versal-net/board.c
@@ -252,6 +252,9 @@
 		mode = "mmc";
 		bootseq = dev_seq(dev);
 		break;
+	case SELECTMAP_MODE:
+		puts("SELECTMAP_MODE\n");
+		break;
 	case SD_MODE:
 		puts("SD_MODE\n");
 		if (uclass_get_device_by_name(UCLASS_MMC,