upsteam find bo api

[zhoucm1]

Hi all,

Since patches are one feature, and contain kernel and libdrm, I attached 
them not by send-mail. Hope not inconvenience.

0001-drm-amdgpu-return-bo-itself-if-userptr-is-cpu-addr-o.patch is 
kernel patch.
Other three is libdrm patches including unit test.

please review.

Regards,
David Zhou
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