Clarify the purpose of arguments.
multi-planer support.

Add wl_kms_create_mp_buffer() to support a multiplaner buffer such
as NV12/NV16.

The API will be supported in protocol version 2 and above.
Add UYVY, RGB888, and BGR888 as supported pixel formats.
Fix: store details of 2nd and 3rd planes.
Do not import multi-plane DMABUF.

This is a workaround to avoid crash in the kernel.
Add missing color formats that are supported.