Update types.hal comments

(1) Specify rules for property to area mapping
(2) Fix comment for WHEEL_TICK property
(3) Document the need for supported gears from vhal. CURRENT_GEAR and GEAR_SELECTION should report the list of available gears in the vehicle. This helps in determining the driving state of the vehicle.
Merge changes from ag/4051112 ag/4026897

Bug: 79434788
Bug: 77849652
Bug: 79260189
Test: Build and Flash
Change-Id: Ib2bd488a5ec09fe3bdf8807c253aebcdb240324b