Rename TEXT_BASE into CONFIG_SYS_TEXT_BASE

The change is currently needed to be able to remove the board
configuration scripting from the top level Makefile and replace it by
a simple, table driven script.

Moving this configuration setting into the "CONFIG_*" name space is
also desirable because it is needed if we ever should move forward to
a Kconfig driven configuration system.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/freescale/p1_p2_rdb/config.mk b/board/freescale/p1_p2_rdb/config.mk
index 2d306bb..18da010 100644
--- a/board/freescale/p1_p2_rdb/config.mk
+++ b/board/freescale/p1_p2_rdb/config.mk
@@ -26,23 +26,23 @@
 
 ifndef NAND_SPL
 ifeq ($(CONFIG_NAND), y)
-TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
+CONFIG_SYS_TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
 LDSCRIPT := $(TOPDIR)/$(CPUDIR)/u-boot-nand.lds
 endif
 endif
 
 ifeq ($(CONFIG_SDCARD), y)
-TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
+CONFIG_SYS_TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
 RESET_VECTOR_ADDRESS = 0xf8fffffc
 endif
 
 ifeq ($(CONFIG_SPIFLASH), y)
-TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
+CONFIG_SYS_TEXT_BASE = $(CONFIG_RAMBOOT_TEXT_BASE)
 RESET_VECTOR_ADDRESS = 0xf8fffffc
 endif
 
-ifndef TEXT_BASE
-TEXT_BASE = 0xeff80000
+ifndef CONFIG_SYS_TEXT_BASE
+CONFIG_SYS_TEXT_BASE = 0xeff80000
 endif
 
 ifndef RESET_VECTOR_ADDRESS