InputTarget: s/displayTransform/rawTransform

Use the term "rawTransform" in InputTarget to better reflect its usage,
since it is used for MotionEvent's getRaw APIs.

This is to explicitly differentiate it from the displayTransform that we
use for hit testing.

Bug: 377846505
Test: atest inputflinger_tests
Flag: EXEMPT refactor
Change-Id: If07fc359152674fa2e3dc4aca10688943e857aab