amdgpu: verify the tested device

Verify the vender ID and driver name.
Open all AMDGPU devices.
Provide an option to open render node.

Tested as root: PASS
Tested as non-privileged user:
All tests failed as expected

v2: Return value in the ene of function amdgpu_open_devices.
    Check the return value of amdgpu_open_devices.
    amdgpu_test is not for USB device for the time being.
    Get the name of node from function drmGetDevices2.
    Drop the legacy drmAvailable() from the test.

Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Alex Xie <AlexBin.Xie@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>