ACPI: DPTF: Correct description of INT3407 / INT3532 attributes

Remove duplicate comments of PBSS for Battery steady state power and
correct the typo for PMAX Maximum platform power.

Signed-off-by: Sumeet Pawnikar <sumeet.r.pawnikar@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>