egl/dri2: Create EGLImages with dmabuf modifiers

egl/dri2: Create EGLImages with dmabuf modifiers

Allow creating EGLImages with dmabuf format modifiers when target is
EGL_LINUX_DMA_BUF_EXT for EGL_EXT_image_dma_buf_import_modifiers.

v2:
- clear modifier assembling and error label name (Eric Engestrom)
v3:
- remove goto jumps within switch-case (Emil Velikov)
- treat zero as valid modifier (Daniel Stone)
- ensure same modifier across all dmabuf planes (Emil Velikov)
v4:
- allow modifiers to add extra planes (Louis-Francis Ratté-Boulianne)
v5:
- fix error checking, some cleanups (Jason Ekstrand)
- pass single copy of the modifier to createImageFromDmaBufs2

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Signed-off-by: Varad Gautam <varad.gautam@collabora.com>
Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>