sched: Fix compilation issue with reset_hmp_stats

reset_hmp_stats was moved to another file and when CONFIG_CFS_BANDWIDTH
is enabled there is code still referencing this in the original file
causing compilation error.

Change-Id: Iab7fc8551b628c443ce751026b06c5ff4ebba39a
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>