sched/core: fix userspace affining threads incorrectly by task name.

To identify certain apps which request max cpu freq to affine its
tasks to specific cpus, besides checking its lib name, task name is
also a factor that we can identify the suspcious task.

Test: build and test the 'perfect kick 2' game.
Bug: 163293825
Bug: 161324271
Change-Id: I4359859db743b4c9122e9df40af0b109370e8f1f
Signed-off-by: Jimmy Shiu <jimmyshiu@google.com>