minigbm: define GBM_BO_IMPORT_FD_MODIFIER

minigbm: define GBM_BO_IMPORT_FD_MODIFIER

This CL aligns the minigbm more with the upstream GBM
by defining GBM_BO_IMPORT_FD_MODIFIER and using
gbm_import_fd_modifier_data instead.

That is, the main difference between the old
gbm_import_fd_planar_data one and the new one is
the format_modifiers variable. In the upstream
GBM, it's a single variable. In the minigbm, it is
an array.

As we know there are no cases when modifiers would
be different for each plane. Thus, it's safe to eliminate
that and adapt more to the upstream.

Change-Id: Iaae062ef1fe9fc9ab0ead09c5f4bfa91d2db67c3
Reviewed-on: https://chromium-review.googlesource.com/1360771
Commit-Ready: Maksim Sisov <msisov@igalia.com>
Tested-by: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Gurchetan Singh <gurchetansingh@chromium.org>