Introduce NX LongPress timeout configuration (2 of 2)

Use a custom seekbar to set more or less delay. Default is set
at max, which is the stock aosp long press time out.

Change-Id: I8ab81ae242c5eacc1fa6b194e5f351b7e88357f4
Merge remote-tracking branch 'upstream/kk4.4' into kk4.4