trivial: remove odd references to 'buildroot2'

In the past there may have been a very good reason to refer to 'buildroot2', but
these days it's just odd.

Signed-off-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

Makefile

@@ -1,4 +1,4 @@
-# Makefile for buildroot2
+# Makefile for buildroot
 #
 # Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
 # Copyright (C) 2006-2013 by the Buildroot developers <buildroot@uclibc.org>

support/kconfig/README.buildroot2 → support/kconfig/README.buildroot

@@ -4,7 +4,7 @@ to suit Buildroot.
 To update:
 	cp -r /usr/src/linux/scripts/kconfig support/kconfig.new
 	cd support/config.new
-	cp -a ../kconfig/patches ../kconfig/README.buildroot2 .
+	cp -a ../kconfig/patches ../kconfig/README.buildroot .
 	quilt push -a
 	# Fix any conflict
 	cd ..