ANDROID: kernel/sched/android.h: add uclamp_* stub functions

Add stubs for uclamp_boosted() and uclamp_latency_sensitive() to keep
out-of-tree scheduler trees building and working properly.

Fixes: a54c38f4 ("Revert "ANDROID: sched: Introduce uclamp latency and boost wrapper"")
Cc: Quentin Perret <qperret@google.com>
Cc: Will McVicker <willmcvicker@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: If1cb6d7964e3a724f3b549bc972df7a2d57d9875