net: gptp: Fix field ordering in gptp_priority_vector struct

The steps_removed field must be placed right after root_system_id
so that priority vector comparision can be done in one memcmp()
call. This fixes the best master clock selection algorithm (BMCA).

Fixes #28177

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>