barebox: bump version

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

boot/barebox/barebox.mk

@@ -4,7 +4,7 @@
 #
 #############################################################
 
-BAREBOX_VERSION = 2011.08.0
+BAREBOX_VERSION = 2011.09.0
 BAREBOX_SOURCE = barebox-$(BAREBOX_VERSION).tar.bz2
 BAREBOX_SITE = http://www.barebox.org/download/