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-k3/sysfw-loader.c b/arch/arm/mach-k3/sysfw-loader.c
index aea640b..c4c5c37 100644
--- a/arch/arm/mach-k3/sysfw-loader.c
+++ b/arch/arm/mach-k3/sysfw-loader.c
@@ -91,7 +91,7 @@
 struct legacy_img_hdr *spl_get_load_buffer(ssize_t offset, size_t size)
 {
 	if (sysfw_loaded)
-		return (struct legacy_img_hdr *)(CONFIG_SYS_TEXT_BASE + offset);
+		return (struct legacy_img_hdr *)(CONFIG_TEXT_BASE + offset);
 	else if (sysfw_load_address)
 		return sysfw_load_address;
 	else