powerpc: Wire up /proc/vmallocinfo to our ioremap()

This adds the necessary bits and pieces to powerpc implementation of
ioremap to benefit from caller tracking in /proc/vmallocinfo, at least
for ioremap's done after mem init as the older ones aren't tracked.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/platforms/iseries/setup.c

@@ -617,7 +617,7 @@ static void iseries_dedicated_idle(void)
 }
 
 static void __iomem *iseries_ioremap(phys_addr_t address, unsigned long size,
-				     unsigned long flags)
+				     unsigned long flags, void *caller)
 {
 	return (void __iomem *)address;
 }