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/arch/arm/mach-ipq40xx/Kconfig b/arch/arm/mach-ipq40xx/Kconfig
index 4eef80e..f9db55c 100644
--- a/arch/arm/mach-ipq40xx/Kconfig
+++ b/arch/arm/mach-ipq40xx/Kconfig
@@ -6,7 +6,7 @@
 config SYS_MALLOC_F_LEN
 	default 0x2000
 
-config SYS_TEXT_BASE
+config TEXT_BASE
 	default 0x87300000
 
 config NR_DRAM_BANKS