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/nand_spl/board/amcc/canyonlands/config.mk b/nand_spl/board/amcc/canyonlands/config.mk
index 688c92b..6819265 100644
--- a/nand_spl/board/amcc/canyonlands/config.mk
+++ b/nand_spl/board/amcc/canyonlands/config.mk
@@ -25,17 +25,17 @@
 #
 
 #
-# TEXT_BASE for SPL:
+# CONFIG_SYS_TEXT_BASE for SPL:
 #
 # On 460EX platforms the SPL is located at 0xfffff000...0xffffffff,
 # in the last 4kBytes of memory space in cache.
 # We will copy this SPL into internal SRAM in start.S. So we set
-# TEXT_BASE to starting address in internal SRAM here.
+# CONFIG_SYS_TEXT_BASE to starting address in internal SRAM here.
 #
-TEXT_BASE = 0xE3003000
+CONFIG_SYS_TEXT_BASE = 0xE3003000
 
 # PAD_TO used to generate a 128kByte binary needed for the combined image
-# -> PAD_TO = TEXT_BASE + 0x20000
+# -> PAD_TO = CONFIG_SYS_TEXT_BASE + 0x20000
 PAD_TO	= 0xE3023000
 
 PLATFORM_CPPFLAGS += -DCONFIG_440=1