Revert "Makefile: Fix install error with make -j option"

This reverts commit d2aae847

.

It is completely and utterly broken.  Module install should not build
any files, and adding broken dependencies to "help" it build files is
complete and utter sh*t.

The kernel should not be built by root, and "make install" and "make
module_install" (that for obvious reasons need to be run as root)
absolutely must not build any files.  They should only ever copy the
already-built files over.

So having dependencies for the install targets is wrong, wrong, wrong.

If you try to install a kernel without building it first, you *should*
get errors. The build system shouldn't try to help root build the files.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Makefile

@@ -981,7 +981,7 @@ _modinst_:
 # boot a modules.dep even before / is mounted read-write.  However the
 # boot script depmod is the master version.
 PHONY += _modinst_post
-_modinst_post: include/config/kernel.release _modinst_
+_modinst_post: _modinst_
 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
 	$(call cmd,depmod)