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vmx(1): use _tos->cyclefreq (thanks cinap)

--- a/sys/src/cmd/vmx/nanosec.c

+++ b/sys/src/cmd/vmx/nanosec.c

@@ -1,5 +1,6 @@

 #include <u.h>

 #include <libc.h>

+#include <tos.h>

 /*

  * nsec() is wallclock and can be adjusted by timesync

@@ -14,28 +15,15 @@

 {

 	static uvlong fasthz, xstart;

 	uvlong x, div;

-	int f, n, i;

-	char tmp[128], *e;

 	if(fasthz == ~0ULL)

 		return nsec() - xstart;

 	if(fasthz == 0){

-		fasthz = ~0ULL;

 		xstart = nsec();

-		if((f = open("/dev/time", OREAD)) >= 0 && (n = read(f, tmp, sizeof(tmp)-1)) > 2){

-			tmp[n] = 0;

-			e = tmp;

-			for(i = 0; i < 3; i++)

-				strtoll(e, &e, 10);

-			if((fasthz = strtoll(e, nil, 10)) < 1)

-				fasthz = ~0ULL;

-			else

-				cycles(&xstart);

-		}

-		close(f);

-		if(fasthz == ~0ULL){

-			fprint(2, "couldn't get fasthz, falling back to nsec()\n");

+		if((fasthz = _tos->cyclefreq) == 0){

+			fasthz = ~0ULL;

+			fprint(2, "cyclefreq not available, falling back to nsec()\n");

 			fprint(2, "you might want to disable aux/timesync\n");

 			return 0;

 		}