x86/power: hibernate: Fix W=1 build kernel-doc warnings

Warnings generated with 'make W=1':

  arch/x86/power/hibernate.c:47: warning: Function parameter or struct member 'pfn' not described in 'pfn_is_nosave'
  arch/x86/power/hibernate.c:92: warning: Function parameter or struct member 'max_size' not described in 'arch_hibernation_header_save'

Add missing parameter documentation in hibernate functions to
fix kernel-doc warnings.

Signed-off-by: Shivank Garg <shivankg@amd.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/20250514062637.3287779-2-shivankg@amd.com