config: don't use /dev/vda2 for kvm guest, its not used since a long time

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40756 3c298f89-4303-0410-b956-a3cf2f4a3e73
imx6: make boardname consistent with other targets

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40758 3c298f89-4303-0410-b956-a3cf2f4a3e73