kbuild: remove obsolete HEAD in kbuild

Makefile: remove obsolete HEAD
arch/cris/Makefile: replace HEAD with assignment to head-y
Signed-off-by: Coywolf Qi Hunt <coywolf@greatcn.org>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>

Makefile

@@ -510,7 +510,6 @@ libs-y		:= $(libs-y1) $(libs-y2)
 #       normal descending-into-subdirs phase, since at that time
 #       we cannot yet know if we will need to relink vmlinux.
 #	So we descend into init/ inside the rule for vmlinux again.
-head-y += $(HEAD)
 vmlinux-objs := $(head-y) $(init-y) $(core-y) $(libs-y) $(drivers-y) $(net-y)
 
 quiet_cmd_vmlinux__ = LD      $@

arch/cris/Makefile

@@ -39,7 +39,7 @@ CFLAGS := $(subst -fomit-frame-pointer,,$(CFLAGS)) -g
 CFLAGS += -fno-omit-frame-pointer
 endif
 
-HEAD := arch/$(ARCH)/$(SARCH)/kernel/head.o
+head-y := arch/$(ARCH)/$(SARCH)/kernel/head.o
 
 LIBGCC = $(shell $(CC) $(CFLAGS) -print-file-name=libgcc.a)