Move View#scrollX and scrollY to dark gray list

The CL transitions View#scrollX and View#scrollY to the dark gray list,
not usable by reflection starting with Q. Instead of accessing them,
developers should use getScrollX(), getScrollY() added in API 1 and
setScrollX(int), setScrollY() added in API 14.

Bug: 123769508
Test: none
Change-Id: I166b9fe897bd35fd97b2e1fc2a8df73691255688