i915/perf: Add OA formats for DG2

Add OA formats for DG2.

v2:
- 40-bit A counter accumulation was broken due to incorrect DG2 format
  definition. Introduce first_a40 to fix the sanity check.
- Drop 64-bit OA formats
- Set the correct OAR format for mi-rpc

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com> #v1