[SPARC64]: Internalize pci_memspace_mask.

The only user was bus_dvma_to_mem() which is no longer used
by any driver, so kill that, and the export of pci_memspace_mask.

The only user now is the PCI mmap support code.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc64/kernel/pci.c b/arch/sparc64/kernel/pci.c
index 246b800..ec0d12a 100644
--- a/arch/sparc64/kernel/pci.c
+++ b/arch/sparc64/kernel/pci.c
@@ -27,6 +27,8 @@
 #include <asm/isa.h>
 #include <asm/prom.h>
 
+#include "pci_impl.h"
+
 unsigned long pci_memspace_mask = 0xffffffffUL;
 
 #ifndef CONFIG_PCI