msm: ipa: gsi 2.0 upgrade

Add support for GSI v2.0. This includes adding a new enum for
v2.0, adding new GSI registers with respective bitmasks/offsets,
and adding new cases for GSI v2.0 while supporting old versions.

Change-Id: I0fe25b77464307dd9f6c7516a6fafa7ff09659dc
CRs-Fixed: 2044228
Signed-off-by: Michael Adisumarta <madisuma@codeaurora.org>