socinfo: add socinfo driver

Add socinfo driver to expose various SoC information to the clients.
This information is useful to various clients in kernel and userspace
to know about the SoC information.

Change-Id: If8b025f19a8eb5bf736d1c88c180654d724bb45f
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>