Update send motion event method name

This is a follow up nit fix for ag/32877524/comment/5f31f8d8_700a2c6b
since the original method name does not suggest sending a serial of
four events.

Bug: 400744833
Test: atest AutoclickControllerTest
Flag: com.android.server.accessibility.enable_autoclick_indicator
Change-Id: Ifdf435f1791038c26e02b332534d103d36cffd68