[mvebu]: update wrt1900ac dts

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41629 3c298f89-4303-0410-b956-a3cf2f4a3e73
[mvebu]: add sysupgrade support

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41630 3c298f89-4303-0410-b956-a3cf2f4a3e73
[mvebu]: use the full boardname for the wrt1900ac image

Signed-off-by: Imre Kaloz <kaloz@openwrt.org>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41631 3c298f89-4303-0410-b956-a3cf2f4a3e73