Convert CONFIG_RAMBOOT_PBL et al to Kconfig

This converts the following to Kconfig:
   CONFIG_RAMBOOT_PBL
   CONFIG_SYS_FSL_PBL_PBI
   CONFIG_SYS_FSL_PBL_RCW

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1043ardb_nand_SECURE_BOOT_defconfig b/configs/ls1043ardb_nand_SECURE_BOOT_defconfig
index 7ec518d..e5c261e 100644
--- a/configs/ls1043ardb_nand_SECURE_BOOT_defconfig
+++ b/configs/ls1043ardb_nand_SECURE_BOOT_defconfig
@@ -16,7 +16,10 @@
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,NAND_BOOT"
+CONFIG_SYS_EXTRA_OPTIONS="NAND_BOOT"
+CONFIG_RAMBOOT_PBL=y
+CONFIG_SYS_FSL_PBL_PBI="board/freescale/ls1043ardb/ls1043ardb_pbi.cfg"
+CONFIG_SYS_FSL_PBL_RCW="board/freescale/ls1043ardb/ls1043ardb_rcw_nand.cfg"
 CONFIG_NAND_BOOT=y
 CONFIG_BOOTDELAY=10
 CONFIG_USE_BOOTARGS=y