mobicore: Add mobicore driver.

Mobicore is an operating system being shipped along with
Trustzone BSP for msm chipsets. Mobicore consists of
several components in the secure world(Trustzone) and
non-secure world(linux kernel, Android user space).

The Mobicore driver communicates with the Mobicore kernel
that exists in the Trustzone.

Change-Id: Ie5b9f05f0bd6c47e55221af983498d08cbc519ab
Signed-off-by: Mona Hossain <mhossain@codeaurora.org>