Rename CONFIG_SYS_TEXT_BASE to CONFIG_TEXT_BASE

The current name is inconsistent with SPL which uses CONFIG_SPL_TEXT_BASE
and this makes it imposible to use CONFIG_VAL().

Rename it to resolve this problem.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/README.arm-relocation b/doc/README.arm-relocation
index bc66449..6bb4e17 100644
--- a/doc/README.arm-relocation
+++ b/doc/README.arm-relocation
@@ -41,7 +41,7 @@
 -----------------------------------------------------------------------------
 
 For boards which boot from spl, it is possible to save one copy
-if CONFIG_SYS_TEXT_BASE == relocation address! This prevents that uboot code
+if CONFIG_TEXT_BASE == relocation address! This prevents that uboot code
 is copied again in relocate_code().
 
 example for the tx25 board booting from NAND Flash:
@@ -58,7 +58,7 @@
 f) u-boot code steps through board_init_f() and calculates
    the relocation address and copy itself to it
 
-If CONFIG_SYS_TEXT_BASE == relocation address, the copying of u-boot
+If CONFIG_TEXT_BASE == relocation address, the copying of u-boot
 in f) could be saved.
 
 -----------------------------------------------------------------------------
@@ -68,10 +68,10 @@
 - fill in struct bd_info infos (check)
 - adapt all boards
 
-- maybe adapt CONFIG_SYS_TEXT_BASE (this must be checked from board maintainers)
+- maybe adapt CONFIG_TEXT_BASE (this must be checked from board maintainers)
   This *must* be done for boards, which boot from NOR flash
 
-  on other boards if CONFIG_SYS_TEXT_BASE = relocation baseaddr, this saves
+  on other boards if CONFIG_TEXT_BASE = relocation baseaddr, this saves
   one copying from u-boot code.
 
 - new function dram_init_banksize() is actual board specific. Maybe
@@ -91,7 +91,7 @@
 
 - This u-boot does no RAM init, nor CPU register setup. Just look
   where it has to copy and relocate itself to this address. If
-  relocate address = CONFIG_SYS_TEXT_BASE (not the same, as the
+  relocate address = CONFIG_TEXT_BASE (not the same, as the
   CONFIG_SPL_TEXT_BASE from the spl code), then there is no need
   to copy, just go on with bss clear and jump to board_init_r.