opencv: add version 3.1
opencv: add version 3.1

Signed-off-by: Hongmei Gou <1a0b1ad71d35a1b0887e5fe5c9a98c271fbce2cd@ti.com>

rcn-ee/meta-processor-sdk,rcn-ee/meta-processor-sdk,rcn-ee/meta-processor-sdk