Merge patch series "ISA string parser cleanups"

Conor Dooley <conor@kernel.org> says:

From: Conor Dooley <conor.dooley@microchip.com>

Here are some bits that were discussed with Drew on the "should we
allow caps" threads that I have now created patches for:
- splitting of riscv_of_processor_hartid() into two distinct functions,
  one for use purely during early boot, prior to the establishment of
  the possible-cpus mask & another to fit the other current use-cases
- that then allows us to then completely skip some validation of the
  hartid in the parser
- the biggest diff in the series is a rework of the comments in the
  parser, as I have mostly found the existing (sparse) ones to not be
  all that helpful whenever I have to go back and look at it
- from writing the comments, I found a conditional doing a bit of a
  dance that I found counter-intuitive, so I've had a go at making that
  match what I would expect a little better
- `i` implies 4 other extensions, so add them as extensions and set
  them for the craic. Sure why not like...

* b4-shazam-merge:
  RISC-V: always report presence of extensions formerly part of the base ISA
  dt-bindings: riscv: explicitly mention assumption of Zicntr & Zihpm support
  RISC-V: remove decrement/increment dance in ISA string parser
  RISC-V: rework comments in ISA string parser
  RISC-V: validate riscv,isa at boot, not during ISA string parsing
  RISC-V: split early & late of_node to hartid mapping
  RISC-V: simplify register width check in ISA string parsing

Link: https://lore.kernel.org/r/20230607-audacity-overhaul-82bb867a825f@spud


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>