xtensa: fix parallel make

Make vmlinux.tmp and vmlinux.tmp.gz separate build targets, avoid
removing vmlinux.tmp during vmlinux.tmp.gz build.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>

arch/xtensa/boot/boot-elf/Makefile

@@ -20,9 +20,11 @@ boot-y		:= bootstrap.o
 
 OBJS		:= $(addprefix $(obj)/,$(boot-y))
 
-Image:	vmlinux $(OBJS) arch/$(ARCH)/boot/boot-elf/boot.lds
+vmlinux.tmp: vmlinux
 	$(OBJCOPY) --strip-all -R .comment -R .note.gnu.build-id -O binary \
-		vmlinux vmlinux.tmp
+		$^ $@
+
+Image:	vmlinux.tmp $(OBJS) arch/$(ARCH)/boot/boot-elf/boot.lds
 	$(OBJCOPY) $(OBJCOPY_ARGS) -R .comment \
 		--add-section image=vmlinux.tmp \
 		--set-section-flags image=contents,alloc,load,load,data \
@@ -30,7 +32,6 @@ Image:	vmlinux $(OBJS) arch/$(ARCH)/boot/boot-elf/boot.lds
 	$(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) \
 		-T arch/$(ARCH)/boot/boot-elf/boot.lds \
 		-o arch/$(ARCH)/boot/$@.elf $@.tmp
-	rm -f $@.tmp vmlinux.tmp
 
 Image.initrd:	vmlinux $(OBJS)
 	$(OBJCOPY) --strip-all -R .comment -R .note.gnu.build-id -O binary \
@@ -44,7 +45,7 @@ Image.initrd:	vmlinux $(OBJS)
 	$(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) \
 		-T $(srctree)/arch/$(ARCH)/boot/boot-elf/boot.ld \
 		-o arch/$(ARCH)/boot/$@.elf $@.tmp
-	rm -f $@.tmp vmlinux.tmp
+#rm -f $@.tmp vmlinux.tmp
 
 
 zImage:	Image