build: make scan-build work again

This drops the scan-build related Kconfig options
since it's now possible to simply run

    scan-build [-o outdir] make

and get coreboot built with its report.

There's also no inner make process anymore, and the way
things work should be clearer now.

Also adapt abuild to this new reality.

Change-Id: I03e03334761ec83f718b3235ebf811834cd2e3e3
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/5774
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

util/lint/lint-stable-002-build-dir-handling

@@ -33,7 +33,7 @@ fi
 
 # $1: object directory
 run_printall() {
-$MAKE CONFIG_USE_BLOBS=n CONFIG_CCACHE=n CONFIG_SCANBUILD_ENABLE=n NOMKDIR=1 \
+$MAKE CONFIG_USE_BLOBS=n CONFIG_CCACHE=n NOMKDIR=1 \
 	DOTCONFIG=$TMPCONFIG obj=$1 printall |        \
 	sed -e "s,^ *,," -e "s,^r.mstage-objs:=,,"    \
 	    -e "s,mainboard/[^/]*/[^/]*/,.../,g" |    \