viafb: choose acceleration engine for VX855

Enable 2D hardware acceleration on VX855 for copyarea, imageblit and
fillrect by selecting the correct engine which is the same as in VX800.
Signed-off-by: NFlorian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Scott Fang <ScottFang@viatech.com.cn>
Cc: Joseph Chan <JosephChan@via.com.tw>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/video/via/accel.c

@@ -337,6 +337,7 @@ int viafb_init_engine(struct fb_info *info)
 		viapar->shared->hw_bitblt = hw_bitblt_1;
 		break;
 	case UNICHROME_VX800:
+	case UNICHROME_VX855:
 		viapar->shared->hw_bitblt = hw_bitblt_2;
 		break;
 	default: