mxs: build/profile-related changes
 - change uImage creation to use zImage
 - update image Makefile for further boards with u-boot support
 - add profile for OLinuXino Micro/Nano boards

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



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38876 3c298f89-4303-0410-b956-a3cf2f4a3e73