[POWERPC] 4xx bootwrapper reworks

Make the fixup_memsize function common for all of 4xx as several chips share
the same SDRAM controller.  Also add functions to reset 40x chips and quiesce
the ethernet.

Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com>
diff --git a/arch/powerpc/boot/ebony.c b/arch/powerpc/boot/ebony.c
index eaf0b9b..2b9a809 100644
--- a/arch/powerpc/boot/ebony.c
+++ b/arch/powerpc/boot/ebony.c
@@ -26,6 +26,7 @@
 #include "reg.h"
 #include "io.h"
 #include "dcr.h"
+#include "4xx.h"
 #include "44x.h"
 
 extern char _dtb_start[];
@@ -136,7 +137,7 @@
 	unsigned long sysclk = 33000000;
 
 	ibm440gp_fixup_clocks(sysclk, 6 * 1843200);
-	ibm44x_fixup_memsize();
+	ibm4xx_fixup_memsize();
 	dt_fixup_mac_addresses(ebony_mac0, ebony_mac1);
 	ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
 	ebony_flashsel_fixup();