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-socfpga/Kconfig b/arch/arm/mach-socfpga/Kconfig
index df44530..503c82d 100644
--- a/arch/arm/mach-socfpga/Kconfig
+++ b/arch/arm/mach-socfpga/Kconfig
@@ -40,7 +40,7 @@
 	default 0x2000 if TARGET_SOCFPGA_ARRIA10
 	default 0x2000 if TARGET_SOCFPGA_GEN5
 
-config SYS_TEXT_BASE
+config TEXT_BASE
 	default 0x01000040 if TARGET_SOCFPGA_ARRIA10
 	default 0x01000040 if TARGET_SOCFPGA_GEN5