DM: add static for local variables

variables defined by struct logger_ops just used
in local file, so add static to them.

Tracked-On: #3012
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>

devicemodel/log/kmsg_logger.c

@@ -87,7 +87,7 @@ static void write_to_kmsg(const char *fmt, va_list args)
 	}
 }
 
-struct logger_ops logger_kmsg = {
+static struct logger_ops logger_kmsg = {
 	.name = "kmsg",
 	.is_enabled = is_kmsg_enabled,
 	.get_log_level = get_kmsg_log_level,

devicemodel/log/log.c

@@ -118,7 +118,7 @@ static void write_to_console(const char *fmt, va_list args)
 	vprintf(fmt, args);
 }
 
-struct logger_ops logger_console = {
+static struct logger_ops logger_console = {
 	.name = "console",
 	.is_enabled = is_console_enabled,
 	.get_log_level = get_console_log_level,