armv8: LS1046ARDB: Add QSPI Secure Boot target

Add QSPI Secure Boot target. Also enable sec init.

Signed-off-by: Vinitha Pillai <vinitha.pillai@nxp.com>
Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/board/freescale/ls1046ardb/MAINTAINERS b/board/freescale/ls1046ardb/MAINTAINERS
index ff42bef..758ff9d 100644
--- a/board/freescale/ls1046ardb/MAINTAINERS
+++ b/board/freescale/ls1046ardb/MAINTAINERS
@@ -7,3 +7,7 @@
 F:	configs/ls1046ardb_qspi_defconfig
 F:	configs/ls1046ardb_sdcard_defconfig
 F:	configs/ls1046ardb_emmc_defconfig
+
+M:	Sumit Garg <sumit.garg@nxp.com>
+S:	Maintained
+F:	configs/ls1046ardb_qspi_SECURE_BOOT_defconfig