qcom-scm: add missing prototype for qcom_scm_is_available()

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>

include/linux/qcom_scm.h

@@ -23,6 +23,8 @@ struct qcom_scm_hdcp_req {
 	u32 val;
 };
 
+extern bool qcom_scm_is_available(void);
+
 extern bool qcom_scm_hdcp_available(void);
 extern int qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
 		u32 *resp);