msm: idle_stats: Make idle_stats_device.h userspace accessable

Signed-off-by: Lucille Sylvester <lsylvest@codeaurora.org>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index f95813e..e46dab1 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -423,3 +423,4 @@
 header-y += msm_charm.h
 header-y += tzcom.h
 header-y += qcedev.h
+header-y += idle_stats_device.h