cyclic: stop strdup'ing name in cyclic_register()

We are not checking the return value of strdup(), nor
freeing the string in cyclic_unregister().

However, all current users either pass a string literal or the
dev->name of the client device. So in all cases the name string will
live at least as long as the cyclic_info is registered, so just make
that a requirement.

Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

include/cyclic.h

@@ -31,7 +31,7 @@
 struct cyclic_info {
 	void (*func)(void *ctx);
 	void *ctx;
-	char *name;
+	const char *name;
 	uint64_t delay_us;
 	uint64_t start_time_us;
 	uint64_t cpu_time_us;