optee-os_git.bb: add optee-os recipe and patches

This has moved from meta-linaro to meta-arm as this
is the new place for general recipes for Arm arch
and has a mailing list for external contributors.

Change-Id: Id43f498e35350eb62a718e64011c8b2f8cd85fdd
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>