bpf: prepare liveness internal API for static analysis pass

Move the `updated` check and reset from bpf_update_live_stack() into
update_instance() itself, so callers outside the main loop can reuse
it. Similarly, move write_insn_idx assignment out of
reset_stack_write_marks() into its public caller, and thread insn_idx
as a parameter to commit_stack_write_marks() instead of reading it
from liveness->write_insn_idx. Drop the unused `env` parameter from
alloc_frame_masks() and mark_stack_read().

Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260410-patch-set-v4-6-5d4eecb343db@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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