Use double tap timeout from ViewConfiguration

Instead of having a hard-coded timeout value on our own, use whatever
the framework provides.

Bug: 284727687
Test: atest WMShellUnitTests:PipTouchStateTest
Test: https://android-build.googleplex.com/builds/abtd/run/L16200000961005593
Change-Id: I287065dae7f1146d0b14abeca0913eda84ee7032