build: Use ppc64 for PowerPC 64 bits architecture

The nmk framework now references PowerPC 64 bits architectures as
ppc64. This applies for both little endian, and the future supported
big endian one.
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Laurent Dufour <ldufour@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Makefile

@@ -62,7 +62,7 @@ endif
 # The PowerPC 64 bits architecture could be big or little endian.
 # They are handled in the same way.
 #
-ifeq ($(ARCH),powerpc)
+ifeq ($(ARCH),ppc64)
         ifeq ($(UNAME-M),ppc64)
                 error := $(error ppc64 big endian not yet supported)
         endif

criu/Makefile

@@ -24,8 +24,7 @@ ifeq ($(ARCH),arm64)
         VDSO		:= y
 endif
 
-ifeq ($(ARCH),powerpc)
-        ARCH		:= ppc64
+ifeq ($(ARCH),ppc64)
         SRCARCH		:= ppc64
         LDARCH		:= powerpc:common64
         VDSO		:= y

test/zdtm/Makefile.inc

@@ -18,17 +18,6 @@ ifeq ($(ARCH),x86_64)
 	SRCARCH := x86
 endif
 
-#
-# The PowerPC 64 bits architecture could be big or little endian.
-# They are handled in the same way.
-#
-ifeq ($(shell echo $(ARCH) | sed -e 's/ppc64.*/ppc64/'),ppc64)
-	ifeq ($(ARCH),ppc64)
-		error	:= $(error ppc64 big endian not yet supported)
-	endif
-	SRCARCH	:= ppc64
-endif
-
 CPPFLAGS += -iquote $(LIBDIR)/arch/$(SRCARCH)/include
 
 ifeq ($(strip $(V)),)