drm/vmwgfx: Introduce a pin count to allow for recursive pinning v2

v2: Fix dma buffer validation on resource pinning.

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

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

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

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

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

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

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