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bcm: add cache invalidate before accessing prop buffer

--- a/sys/src/9/bcm/vcore.c

+++ b/sys/src/9/bcm/vcore.c

@@ -147,7 +147,7 @@

 	prop->taglen = vallen;

 	if(vallen > 0)

 		memmove(prop->data, buf, vallen);

-	cachedwbinvse(prop, prop->len);

+	cachedwbinvse(prop, n);

 	for(;;){

 		aprop = busaddr? dmaaddr(prop) : (uintptr)prop;

 		vcwrite(ChanProps, aprop);

@@ -158,6 +158,7 @@

 			return -1;

 		busaddr = 0;

 	}

+	cachedinvse(prop, n);

 	if(prop->req == RspOk &&

 	   prop->tag == tag &&

 	   (prop->taglen&TagResp)) {