core_ctl: Export boost function

Export core control boost function to make it accessible to kernel
modules.

Change-Id: I94359afa433ad57dd5bfeae3cb78a1f196cd02fe
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>
diff --git a/kernel/sched/core_ctl.c b/kernel/sched/core_ctl.c
index ecf6c56..9b21a09 100644
--- a/kernel/sched/core_ctl.c
+++ b/kernel/sched/core_ctl.c
@@ -687,6 +687,7 @@
 
 	return ret;
 }
+EXPORT_SYMBOL(core_ctl_set_boost);
 
 void core_ctl_check(u64 wallclock)
 {