platform/chrome: cros_ec_proto: Fix cros_ec_get_host_command_version_mask kdoc

Mark the documentation block as kernel doc and drop the documentation of
the non-existing parameter "@msg".
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20240524-cros_ec-cmd_versions-v1-2-8a148647d051@weissschuh.netSigned-off-by: Tzung-Bi Shih <tzungbi@kernel.org>

drivers/platform/chrome/cros_ec_proto.c

@@ -426,13 +426,12 @@ static int cros_ec_get_proto_info_legacy(struct cros_ec_device *ec_dev)
 	return ret;
 }
 
-/*
+/**
  * cros_ec_get_host_command_version_mask
  *
  * Get the version mask of a given command.
  *
  * @ec_dev: EC device to call
- * @msg: message structure to use
  * @cmd: command to get the version of.
  * @mask: result when function returns 0.
  *