drm/fb: add setcmap and fix 8-bit support.

This adds support for the setcmap api and fixes the 8bpp
support at least on radeon hardware. It adds a new load_lut
hook which can be called once the color map is setup.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/i915/intel_fb.c b/drivers/gpu/drm/i915/intel_fb.c
index e85d7e9..3ee8db1 100644
--- a/drivers/gpu/drm/i915/intel_fb.c
+++ b/drivers/gpu/drm/i915/intel_fb.c
@@ -60,6 +60,7 @@
 	.fb_imageblit = cfb_imageblit,
 	.fb_pan_display = drm_fb_helper_pan_display,
 	.fb_blank = drm_fb_helper_blank,
+	.fb_setcmap = drm_fb_helper_setcmap,
 };
 
 static struct drm_fb_helper_funcs intel_fb_helper_funcs = {
@@ -206,7 +207,7 @@
 
 //	memset(info->screen_base, 0, size);
 
-	drm_fb_helper_fill_fix(info, fb->pitch);
+	drm_fb_helper_fill_fix(info, fb->pitch, fb->depth);
 	drm_fb_helper_fill_var(info, fb, fb_width, fb_height);
 
 	/* FIXME: we really shouldn't expose mmio space at all */