uboot-sunxi: update pcDuino3 config

 - beef up memory clock to 480
 - fix network config

Signed-off-by: Zoltan HERPAI <wigyori@uid0.hu>



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40714 3c298f89-4303-0410-b956-a3cf2f4a3e73