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/doc/README.phytec.pcm030 b/doc/README.phytec.pcm030
index 29b7637..05faab6 100644
--- a/doc/README.phytec.pcm030
+++ b/doc/README.phytec.pcm030
@@ -5,11 +5,11 @@
 pcm030_LOWBOOT_config:	unconfig
 	@ >include/config.h
 	@[ -z "$(findstring LOWBOOT_,$@)" ] || \
-		{ echo "TEXT_BASE = 0xFF000000"	>board/phytec/pcm030/config.tmp ; \
+		{ echo "CONFIG_SYS_TEXT_BASE = 0xFF000000"	>board/phytec/pcm030/config.tmp ; \
 		  echo "... with LOWBOOT configuration" ; \
 		}
 	@[ -z "$(findstring RAMBOOT_,$@)" ] || \
-	       { echo "TEXT_BASE = 0x00100000" >board/phycore_mpc5200b_tiny/\
+	       { echo "CONFIG_SYS_TEXT_BASE = 0x00100000" >board/phycore_mpc5200b_tiny/\
 			config.tmp ; \
 		 echo "... with RAMBOOT configuration" ; \
 		 echo "... remember to make sure that MBAR is already \