msm: socinfo: Add support for detecting Krait and Krait Pass 2

Add APIs for checking whether the current CPU is Krait and
Krait Pass 2

Change-Id: I5b28e8ae76b2df64675a6808092d792833931544
Signed-off-by: Jin Hong <jinh@codeaurora.org>
Signed-off-by: Shruthi Krishna <skrish@codeaurora.org>