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bcm: dont assume PHYSDRAM 0 in dmaaddr(), fix dmaioaddr()

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

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

@@ -100,13 +100,13 @@

 uintptr

 dmaaddr(void *va)

 {

-	return soc.busdram | (PTR2UINT(va) & ~KSEGM);

+	return soc.busdram | (PADDR(va) - PHYSDRAM);

 }

 static uintptr

 dmaioaddr(void *va)

 {

-	return soc.busio | (PTR2UINT(va) & ~VIRTIO);

+	return soc.busio | ((uintptr)va - VIRTIO);

 }

 static void