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-apple/Kconfig b/arch/arm/mach-apple/Kconfig
index 75ee21e0..294690e 100644
--- a/arch/arm/mach-apple/Kconfig
+++ b/arch/arm/mach-apple/Kconfig
@@ -1,6 +1,6 @@
 if ARCH_APPLE
 
-config SYS_TEXT_BASE
+config TEXT_BASE
 	default 0x00000000
 
 config SYS_CONFIG_NAME
@@ -16,6 +16,6 @@
 	default 0x4000
 
 config LNX_KRNL_IMG_TEXT_OFFSET_BASE
-	default SYS_TEXT_BASE
+	default TEXT_BASE
 
 endif