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>

board/lpc2292sodimm/config.mk

diff --git a/board/lpc2292sodimm/config.mk b/board/lpc2292sodimm/config.mk
index b28f418..4891792 100644
--- a/board/lpc2292sodimm/config.mk
+++ b/board/lpc2292sodimm/config.mk
@@ -26,5 +26,5 @@
 #
 
 #address where u-boot will be relocated
-#TEXT_BASE = 0x0
-TEXT_BASE = 0x81500000
+#CONFIG_SYS_TEXT_BASE = 0x0
+CONFIG_SYS_TEXT_BASE = 0x81500000