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zynq: use KADDR() for kmap() if we can avoiding the mapping

--- a/sys/src/9/zynq/mmu.c

+++ b/sys/src/9/zynq/mmu.c

@@ -286,6 +286,8 @@

 	ulong *e, *v;

 	int i, s;

+	if(cankaddr(page->pa))

+		return (KMap*)KADDR(page->pa);

 	if(up == nil)

 		panic("kmap: up=0 pc=%#.8lux", getcallerpc(&page));

 	if(up->l1 == nil)

@@ -329,6 +331,8 @@

 	ulong *e;

 	va = (uintptr) arg;

+	if(va >= KZERO)

+		return;

 	if(up->l1 == nil || (up->l1->va[L1X(KMAP)] & 3) == 0)

 		panic("kunmap: no kmaps");

 	if(va < KMAP || va >= KMAP + NKMAP * BY2PG)