armv8: LS2080A: Adjust memory map for secure boot headers for NOR-boot

This patch adjusts memory map for secure boot headers on LS2080AQDS
and LS2080ARDB platforms. Secure boot headers are placed on NOR
flash at offset 0x00600000.

Signed-off-by: Udit Agarwal <udit.agarwal@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls2080ardb/README b/board/freescale/ls2080ardb/README
index f228d80..205c45c 100644
--- a/board/freescale/ls2080ardb/README
+++ b/board/freescale/ls2080ardb/README
@@ -92,6 +92,7 @@
 Boot firmware (U-Boot)		0x00100000
 Boot firmware Environment	0x00300000
 PPA firmware			0x00400000
+Secure Headers			0x00600000
 Cortina PHY firmware		0x00980000
 DPAA2 MC			0x00A00000
 DPAA2 DPL			0x00D00000