Convert mSampleEventTimes to std::vector

We will be adding another vector, mIsResampled, to MotionEvent. It will
closely follow the mSampleEventTimes design.

To facilitate this, convert mSampleEventTimes to std::vector.

Bug: 167946721
Test: atest libinput_tests
Change-Id: I2c8f7f4d6e3fc5ff75376cf2c66137a3b6a8349c
2 files changed