frameworks/base: Fix for headset switch detect

- Headset Switch detect is not functional
- Headset driver on modem in 8x25 and 7x27A targets
  introduces a delay of 500ms before reporting headset
  events to application processor to avoid the problem
  of spurious interrupts being reported due to hardware
  limitation on these targets. Frameworks code in JB
  treats button release event received after 500ms after
  button press as long press event and generates WEBSEARCH
  event. Due to this all the events in 8x25 and 7x27A
  are interpreted as long press events.
- To avoid this problem increase the timeout to more than
  500ms by introducing headset hook delay property for
  these targets.

CRs-fixed: 387247
(cherry picked from commit 5878d849442af33378805f7b9964102119c2fc93)

Change-Id: I03a77666bb217168f7c362bd775dadfbe09fe638