Merge patch "riscv: stacktrace: convert arch_stack_walk() to noinstr"

This first patch in the larger series is a fix, so I'm merging it into
fixes while the rest of the patch set is still under development.

* b4-shazam-merge:
  riscv: stacktrace: convert arch_stack_walk() to noinstr

Link: https://lore.kernel.org/r/20240613-dev-andyc-dyn-ftrace-v4-v1-0-1a538e12c01e@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>