msm: gsi: Support GSI register version 2

GSI core Registers S/W interface has many
non backward compatible changes on sdxprairie.
E.g. registers offsets inside the GSI block.
This change adds support for version 2 of the SWI.

CRs-Fixed: 2295428
Change-Id: I3075683d2effe0d3a0d50d7ffd9d8798763b2387
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>