[POWERPC] Remove redundant declaration of hose_list

It is already declared in ppc-pci.h which is included.
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/pci-common.c

@@ -50,8 +50,6 @@ static DEFINE_SPINLOCK(hose_spinlock);
 /* XXX kill that some day ... */
 static int global_phb_number;		/* Global phb counter */
 
-extern struct list_head hose_list;
-
 /*
  * pci_controller(phb) initialized common variables.
  */