platform/chrome: cros_ec_debugfs: fix kernel-doc warning

Fix the following kernel-doc warning:

$ ./scripts/kernel-doc -none drivers/platform/chrome/*
[...]
warning: This comment starts with '/**', but isn't a kernel-doc comment.

Fixes: 14bb09b32f43 ("platform/chrome: cros_ec: Separate logic for getting panic info")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Link: https://lore.kernel.org/r/20230411053308.1572493-1-tzungbi@kernel.org

drivers/platform/chrome/cros_ec_debugfs.c

@@ -400,7 +400,7 @@ static void cros_ec_cleanup_console_log(struct cros_ec_debugfs *debug_info)
 	}
 }
 
-/**
+/*
  * Returns the size of the panicinfo data fetched from the EC
  */
 static int cros_ec_get_panicinfo(struct cros_ec_device *ec_dev, uint8_t *data,