rockchip: Add API to create BO object from existing handle

Certain use cases involve importing BO from Prime FD and obtaining a
handle, which then needs to be imported into libdrm.

Change-Id: Ibe28f719d1287e2cc5fb62523239635f8baac901
Signed-off-by: Tomasz Figa <tfiga@google.com>
2 files changed