msm: gsi: Update Channel Scratch structures for GSI 2.5

GSI 2.5 introduced changes to the GSI channel scratches
including the SWI fields. E.g. due to removal of smart
prefetch from MCS. This change adapt the code for the new
scratch structures for MHI, xDCI and GPI protocols.

CRs-Fixed: 2260038
Change-Id: Ib79e3dc3356e65c8767d1f8e9005db34dd0061e4
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>