coresight: Export coresight-stm header to userspace

Export coresight-stm header for userspace STM logging
definitions.

Change-Id: I75923ea8beea36269995e311c3fbb2667beac3cc
Signed-off-by: David Ng <dave@codeaurora.org>
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index 31a152d..5b07403 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -444,3 +444,4 @@
 header-y += idle_stats_device.h
 header-y += genlock.h
 header-y += msm_audio_amrwb.h
+header-y += coresight-stm.h