Remove inputflinger.rc as init file

This is left over from an uncompleted attempt to convert
InputFlinger to it's own process. Once the selinux changes
to allow inputflinger go in, it seems that without this change
we actually try to start an InputFlinger process only to have it
harmlessly crash.

Bug: 80101428
Bug: 113136004
Bug: 111440400
Test: Boots
Change-Id: I82079a4b5916f48a7c15bcd7be2d2810ebefefd5