Just change value:
cd /boot/dtb
dtc -I dtb -O dts -o sun4i-a10-olinuxino-lime.dts sun4i-a10-olinuxino-lime.dtb
sed -i -e 's/dr_mode = "otg";/dr_mode = "host";/g' sun4i-a10-olinuxino-lime.dts
dtc -I dts -O dtb -o sun4i-a10-olinuxino-lime.dtb sun4i-a10-olinuxino-lime.dts
Then make a reboot.