msm: spm-v2: Use proper register offsets for SAW2_v3.0

Current code get the register offsets for SAW2 based
on hardcode macros. Use SAW2 major, minor numbers to
get the proper register offsets to different versions
of SAW2 controllers(i.e: SAW2_v2.1 and SAW2_v3.0) and
this patch remove the SAW2_v1.1 controller related code.

Change-Id: Ib80e06caab7d999bfec3ba94b786de2f5ef2074c
Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org>