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pc64: dont reuse mtrr slots that are above 4GB

we used to override/reuse mtrr slots over 4GB as the
kernel wasnt able to use that memory. pc64 can.

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

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

@@ -295,8 +295,7 @@

 	for(i = 0; i < vcnt; i++){

 		mtrrget(&mtrr, i);

 		mok = mtrrdec(&mtrr, &mp, &msize, &mtype);

-		/* reuse any entry for addresses above 4GB */

-		if(!mok || mp == base && msize == size || mp >= (1LL<<32)){

+		if(!mok || mp == base && msize == size){

 			slot = i;

 			break;

 		}

-- 

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