Remove set_cpuset_policy due to new taskprofiles for SF threads

Now that we have this CL
(Change-Id: I6746e768fbf850202f2008f5e2131326e3a8f6a8)
SurfaceFlinger: add custom taskprofiles for SF threads

Maybe it's time we got rid of the old interface #set_cpuset_policy
Because the old interface gonna be covered and it can be confusing.

Bug: 267383322
Test: Remove this line of code or changing to something else like
 SP_FOREGROUND,it won't make any real difference.
Change-Id: Icaedeb17ddf2b14a5113ea84da0bb4e17d4abd74
Signed-off-by: lihaizhou <lihaizhou@coolpad.com>