pm: cpupower: remove hard-coded topology depth values

Remove hard-coded topology depth values and replace them with
defines to improve code readability and maintainability in
cpupower-monitor code.

Link: https://lore.kernel.org/r/20250305225342.19447-3-skhan@linuxfoundation.org


Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>