Fix missing global symbol

If using hsakmt as a shared library

Change-Id: I66a1849a46bd7009813d49824d0d059e8a511038
Signed-off-by: Jeremy Newton <Jeremy.Newton@amd.com>

src/libhsakmt.ver

@@ -81,6 +81,7 @@ hsaKmtWaitOnEvent_Ext;
 hsaKmtWaitOnMultipleEvents_Ext;
 hsaKmtReplaceAsanHeaderPage;
 hsaKmtReturnAsanHeaderPage;
+hsaKmtGetAMDGPUDeviceHandle;
 
 local: *;
 };