Load libdrm at run time

Remove the compile time dependency on libdrm. Load it at the run
time instead.

Add the headers missed from smi-lib

Change-Id: Ie1ecf293b51425b6a61c502d11a42809dc099f70

amd_smi/include/impl/amd_smi_gpu_device.h

@@ -57,13 +57,13 @@ class AMDSmiGPUDevice: public AMDSmiDevice {
             AMDSmiDevice(AMD_GPU), gpu_id_(gpu_id), drm_(drm) {}
 
     uint32_t get_gpu_id() const;
-    int amdgpu_query_info(unsigned info_id,
+    amdsmi_status_t amdgpu_query_info(unsigned info_id,
                     unsigned size, void *value) const;
-    int amdgpu_query_hw_ip(unsigned info_id, unsigned hw_ip_type,
+    amdsmi_status_t amdgpu_query_hw_ip(unsigned info_id, unsigned hw_ip_type,
             unsigned size, void *value) const;
-    int amdgpu_query_fw(unsigned info_id, unsigned fw_type,
+    amdsmi_status_t amdgpu_query_fw(unsigned info_id, unsigned fw_type,
             unsigned size, void *value) const;
-    int amdgpu_query_vbios(void *info) const;
+    amdsmi_status_t amdgpu_query_vbios(void *info) const;
  private:
     uint32_t gpu_id_;
     AMDSmiDrm& drm_;