powerpc/c29xpcie: Add secure boot support

Add NOR and SPI flash secure boot target for C29XPCIE board.

Signed-off-by: Po Liu <Po.Liu@freescale.com>
Signed-off-by: Mingkai.Hu <Mingkai.Hu@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/board/freescale/c29xpcie/MAINTAINERS b/board/freescale/c29xpcie/MAINTAINERS
index db2e5e3..3308839 100644
--- a/board/freescale/c29xpcie/MAINTAINERS
+++ b/board/freescale/c29xpcie/MAINTAINERS
@@ -6,3 +6,5 @@
 F:	configs/C29XPCIE_defconfig
 F:	configs/C29XPCIE_NAND_defconfig
 F:	configs/C29XPCIE_SPIFLASH_defconfig
+F:	configs/C29XPCIE_NOR_SECBOOT_defconfig
+F:	configs/C29XPCIE_SPIFLASH_SECBOOT_defconfig