FrontRunner/Toucan-AF: boards will be renamed to fit ADLINK scheme

Originally developed by LiPPERT and after the acquisition marketed as
'LiPPERT by ADLINK', the plan is now to streamline both boards into the
ADLINK naming scheme.  But AFAIK a few have already been sold and as of
this writing the website still advertises the old names.  And in any case
the veteran LX products will continue to be sold by ADLINK under their
original names.

So create CONFIG_VENDOR_ADLINK, currently only telling users to look under
LiPPERT (however any future boards will be added here).

Further add an explanation to CONFIG_VENDOR_LIPPERT, and in the Mainboard
model selection show both names.

Change-Id: Iaafa88533ef4cce33243293c3d55754e7e93d003
Signed-off-by: Jens Rottmann <JRottmann@LiPPERTembedded.de>
Reviewed-on: http://review.coreboot.org/3046
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

src/mainboard/adlink/Kconfig

@@ -0,0 +1,10 @@
+if VENDOR_ADLINK
+
+comment "see under vendor LiPPERT"
+# any further boards will then be ADLINK
+
+config MAINBOARD_VENDOR
+	string
+	default "ADLINK"
+
+endif # VENDOR_ADLINK