Add more clang-tidy checks.

This adds all the generic checks. There are some more project specific
ones that could be selected but this is a good start and has already
found some lint errors.

Change-Id: I7bb9d9347f5270862c2ff586eb7c86feead9e4bb
diff --git a/src/arch/aarch64/handler.c b/src/arch/aarch64/handler.c
index 8999403..94a9722 100644
--- a/src/arch/aarch64/handler.c
+++ b/src/arch/aarch64/handler.c
@@ -52,6 +52,8 @@
 struct hvc_handler_return hvc_handler(size_t arg0, size_t arg1, size_t arg2,
 				      size_t arg3)
 {
+	(void)arg3;
+
 	struct hvc_handler_return ret;
 
 	ret.new = NULL;