support: add resync.ms option to node.driver

Move some of the tracking code for the DLL to where it is used.

Add resync.ms (default 10) option at which we give up rate adjusting
and instead do a hard resync. This results in a jump in the position
of the graph clock.

spa/include/spa/utils/defs.h

@@ -156,6 +156,10 @@ struct spa_fraction {
 ({							\
 	fminf(fmaxf(v, low), high);			\
 })
+#define SPA_CLAMPD(v,low,high)				\
+({							\
+	fmin(fmax(v, low), high);			\
+})
 
 
 #define SPA_SWAP(a,b)					\