crypto: msm: ota: multiple ota devices support.

This patch provides multiple hw devices support for ota crypto driver.
The driver dynamically allocates hardware resources for each ota crypto
operations. Further more, the stat structure in the driver
is changed to support device tree.

Change-Id: I701fe08ecc51f53ddbe6e2b76b2fb65ab79190d2
Acked-by: Chemin Hsieh <cheminh@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>