[POWERPC] Remove unused machine call outs

When we moved to arch/powerpc we actively tried to avoid using the
ppc_md.setup_io_mappings().  Currently no board ports use it so let's
remove it to avoid any new boards using it.

Also, remove early_serial_map() since we don't even have a call out for
it in arch/powerpc.
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/mm/init_32.c

@@ -185,8 +185,6 @@ void __init MMU_init(void)
 	/* Map in I/O resources */
 	if (ppc_md.progress)
 		ppc_md.progress("MMU:setio", 0x302);
-	if (ppc_md.setup_io_mappings)
-		ppc_md.setup_io_mappings();
 
 	/* Initialize the context management stuff */
 	mmu_context_init();

include/asm-powerpc/machdep.h

@@ -198,9 +198,6 @@ struct machdep_calls {
 	   May be NULL. */
 	void		(*init)(void);
 
-	void		(*setup_io_mappings)(void);
-
-	void		(*early_serial_map)(void);
 	void		(*kgdb_map_scc)(void);
 
 	/*