torture: add missing dependency on hrtimer.h

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

include/linux/torture.h

@@ -21,6 +21,7 @@
 #include <linux/debugobjects.h>
 #include <linux/bug.h>
 #include <linux/compiler.h>
+#include <linux/hrtimer.h>
 
 /* Definitions for a non-string torture-test module parameter. */
 #define torture_param(type, name, init, msg) \