fixes BeagleBoard C4 detection
error message in serial console was:
"WARNING: Could not determine device tree to use"
change is found in upstream u-boot
Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43392 3c298f89-4303-0410-b956-a3cf2f4a3e73