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>

post/Makefile

@@ -26,7 +26,8 @@ include $(OBJTREE)/include/autoconf.mk
 
 LIB				= libpost.a
 GPLIB-$(CONFIG_HAS_POST)	+= libgenpost.a
-COBJS-$(CONFIG_HAS_POST)	+= post.o tests.o
+COBJS-$(CONFIG_HAS_POST)	+= post.o
+COBJS-$(CONFIG_POST_STD_LIST)	+= tests.o
 
 SPLIB-$(CONFIG_HAS_POST) = drivers/libpostdrivers.a
 SPLIB-$(CONFIG_HAS_POST) += $(shell if [ -d lib_$(ARCH) ]; then echo \