POST cleanup.

- Revives POST for blackfin arch;
- Removes redundant code:
     arch/blackfin/lib/post.c
     arch/powerpc/cpu/ppc4xx/commproc.c
     arch/powerpc/cpu/mpc512x/common.c
- fixes up the post_word_{load|store} usage.

Signed-off-by: Michael Zaidman <michael.zaidman@gmail.com>
Acked-by: Detlev Zundel <dzu@denx.de>
Tested-by: Anatolij Gustschin <agust@denx.de>

List of the maintainers of the affected by patch boards:
Cc: Stephan Linz <linz@li-pro.net>
Cc: Denis Peter <d.peter@mpl.ch>
Cc: Matthias Fuchs <matthias.fuchs@esd-electronics.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Niklaus Giger <niklaus.giger@netstal.com>
Cc: Larry Johnson <lrj@acm.org>
Cc: Feng Kan <fkan@amcc.com>

board/xes/xpedite1000/xpedite1000.c

@@ -196,20 +196,4 @@ int post_hotkeys_pressed(void)
 {
 	return ctrlc();
 }
-
-void post_word_store(ulong a)
-{
-	volatile ulong *save_addr =
-		(volatile ulong *)(CONFIG_SYS_POST_WORD_ADDR);
-
-	*save_addr = a;
-}
-
-ulong post_word_load(void)
-{
-	volatile ulong *save_addr =
-		(volatile ulong *)(CONFIG_SYS_POST_WORD_ADDR);
-
-	return *save_addr;
-}
 #endif