arm64: versal: Add Xilinx Versal Virtual QEMU board

Virtual QEMU board is generating DTB self and putting it to
VERSAL_QEMU_DTB_ADDR address.
Board is using CONFIG_OF_BOARD which ensures that u-boot is aligned with
board created by QEMU.

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

arch/arm/mach-versal/Kconfig

@@ -36,4 +36,9 @@ config COUNTER_FREQUENCY
 config ZYNQ_SDHCI_MAX_FREQ
 	default 200000000
 
+config VERSAL_OF_BOARD_DTB_ADDR
+	hex
+	default 0x1000
+	depends on OF_BOARD
+
 endif

arch/arm/mach-versal/cpu.c

@@ -67,3 +67,17 @@ u64 get_page_table_size(void)
 {
 	return 0x14000;
 }
+
+#if defined(CONFIG_OF_BOARD)
+void *board_fdt_blob_setup(void)
+{
+	static void *fw_dtb = (void *)CONFIG_VERSAL_OF_BOARD_DTB_ADDR;
+
+	if (fdt_magic(fw_dtb) != FDT_MAGIC) {
+		printf("DTB is not passed via %llx\n", (u64)fw_dtb);
+		return NULL;
+	}
+
+	return fw_dtb;
+}
+#endif