Allow dynamic config of AP_POWER_STATE_REQ

- Default VHAL is used in many devices.
- The devices have different suspend capability. So, we need a mechanism
  to have different config of AP_POWER_STATE_REQ.
- The value of ro.vendor.fake_vhal.ap_power_state_req.config is set to
  AP_POWER_STATE_REQ's config.

Bug: 229427592
Test: Set a ro.vendor.fake_vhal.ap_power_state_req.config to 0x5 and
check if car_service HAL dump shows "isDeepSleepAllowed:true,
isHibernationAllowed:true".

Change-Id: I9eee87d139ab86066dcf7269f841921e20e9cbbc