qemu: clean up target page usage in msix

Since cpu_register_phys_memory does not require size to be a multiple of
target page size, simply make msix page size 0x1000.  Do this in msix,
reverting part of 5e520a7d500ec2569d22d80f9ef4272a34cb3c80, as we no
longer have to pass target page around.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/hw/msix.h b/hw/msix.h
index 9367ba3..3427778 100644
--- a/hw/msix.h
+++ b/hw/msix.h
@@ -3,9 +3,8 @@
 
 #include "qemu-common.h"
 
-int msix_init(struct PCIDevice *dev, unsigned short nentries,
-              unsigned bar_nr, unsigned bar_size,
-              target_phys_addr_t page_size);
+int msix_init(PCIDevice *pdev, unsigned short nentries,
+              unsigned bar_nr, unsigned bar_size);
 
 void msix_write_config(PCIDevice *pci_dev, uint32_t address,
                        uint32_t val, int len);