msm: kgsl: Suport microcode jumptables and bootstrap for A420

Add the bits and pieces to support fast jumptables and microcode
bootstrap for the A420 target.

Change-Id: Ic0dedbadcd5bff3f691d02ae6a281832a2a3e664
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
Signed-off-by: Vladimir Razgulin <vrazguli@codeaurora.org>