[SPARC64]: Bump PROMINTR_MAX to 32.

Some devices have more than 15 which was the previous
setting.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/asm-sparc64/openprom.h

@@ -177,7 +177,7 @@ struct linux_nodeops {
 /* More fun PROM structures for device probing. */
 #define PROMREG_MAX     24
 #define PROMVADDR_MAX   16
-#define PROMINTR_MAX    15
+#define PROMINTR_MAX    32
 
 struct linux_prom_registers {
 	unsigned which_io;	/* hi part of physical address			*/