kbuild: remove redundant mkdir from ./Kbuild

These two targets are added to "targets".  Their directories are
automatically created.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/Kbuild b/Kbuild
index 94c75276..f1997d8 100644
--- a/Kbuild
+++ b/Kbuild
@@ -17,7 +17,6 @@
 
 # We use internal kbuild rules to avoid the "is up to date" message from make
 kernel/bounds.s: kernel/bounds.c FORCE
-	$(Q)mkdir -p $(dir $@)
 	$(call if_changed_dep,cc_s_c)
 
 $(obj)/$(bounds-file): kernel/bounds.s FORCE
@@ -53,7 +52,6 @@
 # We use internal kbuild rules to avoid the "is up to date" message from make
 arch/$(SRCARCH)/kernel/asm-offsets.s: arch/$(SRCARCH)/kernel/asm-offsets.c \
                                       $(obj)/$(timeconst-file) $(obj)/$(bounds-file) FORCE
-	$(Q)mkdir -p $(dir $@)
 	$(call if_changed_dep,cc_s_c)
 
 $(obj)/$(offsets-file): arch/$(SRCARCH)/kernel/asm-offsets.s FORCE