Revert "site-local: Allow to read Makefile.inc w/o .config"

This reverts commit 275f2e22a1.
Since in this commit the inclusion of site-local/Makefile.inc was moved
outside of the guard 'ifeq ($(NOCOMPILE),1)', this Makefile.inc will be
included always here (what seems to be the intention of this commit).

As we have a second place where site-local/Makefile.inc is included
(top-level Makefile.inc via subdirs-y class) this unconditional include
leads to a double included site-local/Makefile.inc. Therefore one will
get errors if a separate rule is used in site-local/Makefile.inc.

Change-Id: I0a693c1d793b978c8023e4f107dce139d537d8db
Signed-off-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35786
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

Makefile

@@ -144,12 +144,11 @@ endif
 	\mv -f $@.tmp $@ 2> /dev/null
 	rm -f $@.tmp
 
--include $(TOPLEVEL)/site-local/Makefile.inc
-
 ifeq ($(NOCOMPILE),1)
 include $(TOPLEVEL)/Makefile.inc
 include $(TOPLEVEL)/payloads/Makefile.inc
 include $(TOPLEVEL)/util/testing/Makefile.inc
+-include $(TOPLEVEL)/site-local/Makefile.inc
 real-all:
 	@echo "Error: Expected config file ($(DOTCONFIG)) not present." >&2
 	@echo "Please specify a config file or run 'make menuconfig' to" >&2