egl: add width/height as EXT_image_dma_buf_import attrs

Although not listed amongst the initial EGL_LINUX_DRM_FOURCC_EXT and
friends list, the spec reads

   ... Required attributes and their values are as
   follows:

    * EGL_WIDTH & EGL_HEIGHT: The logical dimensions of the buffer in pixels

    * EGL_LINUX_DRM_FOURCC_EXT: The pixel format of the buffer, as specified
      by drm_fourcc.h and used as the pixel_format parameter of the
      drm_mode_fb_cmd2 ioctl.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/egl/main/eglimage.c

@@ -107,6 +107,12 @@ _eglParseEXTImageDmaBufImportAttribs(_EGLImageAttribs *attrs, _EGLDisplay *dpy,
                                      EGLint attr, EGLint val)
 {
    switch (attr) {
+   case EGL_WIDTH:
+      attrs->Width = val;
+      break;
+   case EGL_HEIGHT:
+      attrs->Height = val;
+      break;
    case EGL_LINUX_DRM_FOURCC_EXT:
       attrs->DMABufFourCC.Value = val;
       attrs->DMABufFourCC.IsPresent = EGL_TRUE;