tracing/probes: Refactor parse_probe_arg()

Decompose parse_probe_arg() by extracting register, memory/symbol,
dereference, immediate, and default BTF/CPU parsing handlers into
dedicated static helper functions (parse_probe_arg_register,
parse_probe_arg_mem_symbol, parse_probe_arg_deref, parse_probe_arg_imm,
and parse_probe_arg_default). This modularizes the recursive argument
parser and improves readability.

Link: https://lore.kernel.org/all/178399138581.27810.9471730417467607229.stgit@devnote2/

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

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