libhsakmt: query/use render node fds that libdrm uses.

Query render node fds that libdrm uses for current process and
use them at Thunk if available.

v2: avoid naming conflict with amdgpu_device_get_fd from amdgpu.h

Signed-off-by: Xiaogang Chen<Xiaogang.Chen@amd.com>
Change-Id: Id7288c03730f4a4c9c3644e37ca4725fec71a471

include/hsakmt.h

@@ -602,6 +602,16 @@ hsaKmtUnmapGraphicHandle(
                 HSAuint64              SizeInBytes              //IN
                 );
 
+/**
+ * Get an AMDGPU device handle for a GPU node
+ */
+HSAKMT_STATUS
+HSAKMTAPI
+hsaKmtGetAMDGPUDeviceHandle(
+                HSAuint32               NodeId,                    //IN
+                HsaAMDGPUDeviceHandle   *DeviceHandle              //OUT
+                );
+
 /**
   Allocate GWS resource for a queue
  */