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pc kernel: assume tsc and lapic clock rate on application processors is the same as on bootrap processor

--- a/sys/src/9/pc/apic.c

+++ b/sys/src/9/pc/apic.c

@@ -141,7 +141,7 @@

 }

 /*

- *  use the i8253 clock to figure out our lapic timer rate.

+ *  use the i8253/tsc clock to figure out our lapic timer rate.

  */

 static void

 lapictimerinit(void)

@@ -149,6 +149,11 @@

 	uvlong x, v, hz;

 	Apictimer *a;

 	int s;

+

+	if(m->machno != 0){

+		lapictimer[m->machno] = lapictimer[0];

+		return;

+	}

 	s = splhi();

 	a = &lapictimer[m->machno];

--- a/sys/src/9/pc/i8253.c

+++ b/sys/src/9/pc/i8253.c

@@ -130,6 +130,13 @@

 	int loops, x, y;

 	uvlong a, b, cpufreq;

+	if(m->machno != 0){

+		m->cpuhz = MACHP(0)->cpuhz;

+		m->cpumhz = MACHP(0)->cpumhz;

+		m->loopconst = MACHP(0)->loopconst;

+		return;

+	}

+

 	ilock(&i8253);

 	for(loops = 1000;;loops += 1000) {

 		/*