Rename android.view.InputEvent obtain copy from native methods

Rename obtain Java InputEvent copy from native methods for Key and
Motion events for consistency. This CL renames
1. android_view_MotionEvent_obtainAsCopy ->
   android_view_MotionEvent_obtainAsCopy
2. android_view_KeyEvent_fromNative ->
   android_view_KeyEvent_obtainAsCopy
3. android_view_KeyEvent_toNative ->
   android_view_KeyEvent_obtainAsCopy

Bug: 324375527
Test: atest MotionEventTest KeyEventTest
Change-Id: I2a2fee29fd8ffcce04a939d19d3f7a0ce0c5dcf1