iommu: apple-dart: Increase MAX_DARTS_PER_DEVICE to 3

ISP needs this.

Signed-off-by: Hector Martin <marcan@marcan.st>

Author: marcan

drivers/iommu/apple-dart.c

@@ -38,7 +38,7 @@
 
 #define DART_MAX_STREAMS 256
 #define DART_MAX_TTBR 4
-#define MAX_DARTS_PER_DEVICE 2
+#define MAX_DARTS_PER_DEVICE 3
 
 /* Common registers */