kbuild: drop descend - converting existing users

There was only two users left of descend. Fix them so they
use $(clean)= and $(build)=.
Drop definition of descend.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---

Makefile

@@ -1356,11 +1356,6 @@ build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj
 # $(Q)$(MAKE) $(clean)=dir
 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
 
-#	$(call descend,<dir>,<target>)
-#	Recursively call a sub-make in <dir> with target <target>
-# Usage is deprecated, because make does not see this as an invocation of make.
-descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
-
 endif	# skip-makefile
 
 FORCE:

arch/m68knommu/Makefile

@@ -109,7 +109,7 @@ libs-y	+= arch/m68knommu/lib/
 prepare: include/asm-$(ARCH)/asm-offsets.h
 
 archclean:
-	$(call descend arch/$(ARCH)/boot, subdirclean)
+	$(Q)$(MAKE) $(clean)=arch/m68knommu/boot
 
 include/asm-$(ARCH)/asm-offsets.h: arch/$(ARCH)/kernel/asm-offsets.s \
 				   include/asm include/linux/version.h \

arch/mips/Makefile

@@ -683,7 +683,7 @@ drivers-$(CONFIG_OPROFILE)	+= arch/mips/oprofile/
 
 ifdef CONFIG_LASAT
 rom.bin rom.sw: vmlinux
-	$(call descend,arch/mips/lasat/image,$@)
+	$(Q)$(MAKE) $(build)=arch/mips/lasat/image $@
 endif
 
 #

scripts/Makefile.lib

@@ -229,11 +229,6 @@ if_changed_rule = $(if $(strip $? $(call arg-check, $(cmd_$(1)), $(cmd_$@)) ),\
 
 cmd = @$(if $($(quiet)cmd_$(1)),echo '  $(subst ','\'',$($(quiet)cmd_$(1)))' &&) $(cmd_$(1))
 
-#	$(call descend,<dir>,<target>)
-#	Recursively call a sub-make in <dir> with target <target> 
-# Usage is deprecated, because make do not see this as an invocation of make.
-descend =$(Q)$(MAKE) -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj=$(1) $(2)
-
 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.build obj=
 # Usage:
 # $(Q)$(MAKE) $(build)=dir