include: configs: ti_armv7_common: Add documentation for protected section

Make the section protected by CONFIG_DISTRO_DEFAULTS macro clear.

Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
diff --git a/include/configs/ti_armv7_common.h b/include/configs/ti_armv7_common.h
index dbbeff3..4e30d0d 100644
--- a/include/configs/ti_armv7_common.h
+++ b/include/configs/ti_armv7_common.h
@@ -200,7 +200,7 @@
 #define CFG_EXTRA_ENV_SETTINGS					\
 	BOOTENV
 
-#endif
+#endif /* CONFIG_DISTRO_DEFAULTS */
 
 #endif /* CONFIG_ARM64 */