libdrm: add exynos drm support

this patch adds libdrm_exynos helper layer that inclues some intefaces
for exynos specific gem and virtual display driver and also adds exynos
module name to modtest and vbltest.

Changelog v2:
- fixed exynos broken ioctl.
  the pointer of uint64_t *edid should be removed.
- removed unnecessary definitions.
- added drm prime interfaces.
  this feature is used to share a buffer between drivers or memory managers
  and for this, please, refer to below links:

this patch is based on a link below:
	commit id: d72a44c7c4f5eea9c1e5bb0c36cb9e0224b9ca22

Reviewed-by: Rob Clark <>
Reviewed-by: Alex Deucher <>
Signed-off-by: Inki Dae <>
Signed-off-by: Kyungmin Park <>
Signed-off-by: Rob Clark <>
9 files changed