drm/vmwgfx: Implement screen targets

Add support for the screen target device interface.
Add a getparam parameter and bump minor to signal availability.

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

diff --cc drivers/gpu/drm/vmwgfx/Makefile
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_kms.h
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_mob.c
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
Simple merge

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_surface.c
Simple merge

diff --cc include/uapi/drm/vmwgfx_drm.h
Simple merge