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/hsakmttypes.h

@@ -1409,6 +1409,8 @@ typedef enum _HSA_SVM_UNMAP_TRIGGERS {
 #define HSA_SMI_EVENT_MASK_FROM_INDEX(i) (1ULL << ((i) - 1))
 #define HSA_SMI_EVENT_MSG_SIZE	96
 
+typedef void *HsaAMDGPUDeviceHandle;
+
 #pragma pack(pop, hsakmttypes_h)