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/ls1043aqds_nand_defconfig b/configs/ls1043aqds_nand_defconfig
index 34c2cbc..4f5f62d 100644
--- a/configs/ls1043aqds_nand_defconfig
+++ b/configs/ls1043aqds_nand_defconfig
@@ -24,7 +24,10 @@
 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/ls1043aqds/ls1043aqds_pbi.cfg"
+CONFIG_SYS_FSL_PBL_RCW="board/freescale/ls1043aqds/ls1043aqds_rcw_nand.cfg"
 CONFIG_NAND_BOOT=y
 CONFIG_BOOTDELAY=10
 CONFIG_USE_BOOTARGS=y