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/doc/README.bedbug b/doc/README.bedbug
index 4c1e6c4..35e9d27 100644
--- a/doc/README.bedbug
+++ b/doc/README.bedbug
@@ -18,15 +18,15 @@
 ./common/board.c
 	Added call to initialize debugger on startup.
 
-./arch/ppc/cpu/ppc4xx/Makefile
+./arch/powerpc/cpu/ppc4xx/Makefile
 	Added bedbug_405.c to the Makefile.
 
-./arch/ppc/cpu/ppc4xx/start.S
+./arch/powerpc/cpu/ppc4xx/start.S
 	Added code to handle the debug exception (0x2000) on the 405.
 	Also added code to handle critical exceptions since the debug
 	is treated as critical on the 405.
 
-./arch/ppc/cpu/ppc4xx/traps.c
+./arch/powerpc/cpu/ppc4xx/traps.c
 	Added more detailed output for the program exception to tell
 	if it is an illegal instruction, privileged instruction or
 	a trap. Also added debug trap handler.
@@ -51,7 +51,7 @@
 	hardware breakpoints and stepping through code.  These
 	routines are common to all PowerPC processors.
 
-./arch/ppc/cpu/ppc4xx/bedbug_405.c
+./arch/powerpc/cpu/ppc4xx/bedbug_405.c
 	AMCC  PPC405 specific debugger routines.
 
 
@@ -63,16 +63,16 @@
 	common/cmd_bedbug.c
 		Added call to initialize 860 debugger.
 
-	arch/ppc/cpu/mpc8xx/Makefile
+	arch/powerpc/cpu/mpc8xx/Makefile
 		Added new file "bedbug_860.c" to the makefile
 
-	arch/ppc/cpu/mpc8xx/start.S
+	arch/powerpc/cpu/mpc8xx/start.S
 		Added handler for InstructionBreakpoint (0xfd00)
 
-	arch/ppc/cpu/mpc8xx/traps.c
+	arch/powerpc/cpu/mpc8xx/traps.c
 		Added new routine DebugException()
 
 New Files:
 
-	arch/ppc/cpu/mpc8xx/bedbug_860.c
+	arch/powerpc/cpu/mpc8xx/bedbug_860.c
 		CPU-specific routines for 860 debug registers.