Update LPNH detection

Replaces GestureDetector usage in LPNH handler with internal implementation that we can tweak
in follow up CLs. It's also a pre-requisite for doing a hint haptic.

Flag: CUSTOM_LPNH_THRESHOLDS
Bug: 300219375
Test: Manual
Change-Id: I5a010d8828bf400e9151236554b29f60edba044c
1 file changed