Move arch/ppc to arch/powerpc

As discussed on the list, move "arch/ppc" to "arch/powerpc" to
better match the Linux directory structure.

Please note that this patch also changes the "ppc" target in
MAKEALL to "powerpc" to match this new infrastructure. But "ppc"
is kept as an alias for now, to not break compatibility with
scripts using this name.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Anatolij Gustschin <agust@denx.de>
diff --git a/examples/api/Makefile b/examples/api/Makefile
index bed16f1..5b5f7a6 100644
--- a/examples/api/Makefile
+++ b/examples/api/Makefile
@@ -20,7 +20,7 @@
 # MA 02111-1307 USA
 #
 
-ifeq ($(ARCH),ppc)
+ifeq ($(ARCH),powerpc)
 LOAD_ADDR = 0x40000
 endif
 ifeq ($(ARCH),arm)
@@ -46,8 +46,8 @@
 EXT_COBJ_FILES-$(CONFIG_API) += lib/string.o
 EXT_COBJ_FILES-$(CONFIG_API) += lib/time.o
 EXT_COBJ_FILES-$(CONFIG_API) += lib/vsprintf.o
-ifeq ($(ARCH),ppc)
-EXT_SOBJ_FILES-$(CONFIG_API) += arch/ppc/lib/ppcstring.o
+ifeq ($(ARCH),powerpc)
+EXT_SOBJ_FILES-$(CONFIG_API) += arch/powerpc/lib/ppcstring.o
 endif
 
 # Create a list of source files so their dependencies can be auto-generated