freedreno/regs/a7xx: Necessary changes in regs for A7XX support
What does this MR do and why?
!23217 (merged) is waiting for two other MRs to merge. However the update to regs could be independently reviewed.
Changes:
- Added A7XX regs necessary for sysmem rendering to work.
- Defined all A7XX regs I met even the ones without known meaning.
- Added "usage" field to regs, which is later used to generate usage tables, which in original MR are used for reg stomping.