commit 745945546f7366a413a3a51a37f90caa3a227b1d
breaks the build under Android because some of the
macros used in pm_rps.c are defined in sys/wait.h
which is not included.
Signed-off-by: Tim Gore <tim.gore@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>