drm/sisvga: Add KMS driver for SiS 6326

drivers/gpu/drm/Kconfig

drivers/gpu/drm/Makefile

drivers/gpu/drm/sisvga/Kconfig

drivers/gpu/drm/sisvga/Makefile

drivers/gpu/drm/sisvga/sisvga_bo.c

drivers/gpu/drm/sisvga/sisvga_connector.c

drivers/gpu/drm/sisvga/sisvga_crtc.c

drivers/gpu/drm/sisvga/sisvga_ddc.c

drivers/gpu/drm/sisvga/sisvga_debug.c

drivers/gpu/drm/sisvga/sisvga_debug.h

drivers/gpu/drm/sisvga/sisvga_device.c

drivers/gpu/drm/sisvga/sisvga_device.h

drivers/gpu/drm/sisvga/sisvga_drv.c

drivers/gpu/drm/sisvga/sisvga_drv.h

drivers/gpu/drm/sisvga/sisvga_encoder.c

drivers/gpu/drm/sisvga/sisvga_fbdev.c

drivers/gpu/drm/sisvga/sisvga_framebuffer.c

drivers/gpu/drm/sisvga/sisvga_modes.c

drivers/gpu/drm/sisvga/sisvga_modes.h

drivers/gpu/drm/sisvga/sisvga_plane.c