ppc4xx: Consolidate some of the 405 and 440 macros/structs into 4xx

This patch moves some common 4xx macros and the PPC405_SYS_INFO/
PPC440_SYS_INFO structure into the common ppc4xx.h header.

Lot's of other macros are good candidates to be consolidated this way
in the future.

Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/include/common.h b/include/common.h
index 9865591..46ed6bd 100644
--- a/include/common.h
+++ b/include/common.h
@@ -513,15 +513,13 @@
 
 #if defined(CONFIG_4xx) || defined(CONFIG_IOP480)
 #  if defined(CONFIG_440)
-    typedef PPC440_SYS_INFO sys_info_t;
 #	if defined(CONFIG_440SPE)
 	 unsigned long determine_sysper(void);
 	 unsigned long determine_pci_clock_per(void);
 	 int ppc440spe_revB(void);
 #	endif
-#  else
-    typedef PPC405_SYS_INFO sys_info_t;
 #  endif
+typedef PPC4xx_SYS_INFO sys_info_t;
 void	get_sys_info  ( sys_info_t * );
 #endif