video: auo_k190x: add code shared by controller drivers

The AUO-K190X controllers share a very similar set of commands and
can therefore also share most of the driver code.

Signed-off-by: Heiko Stübner <heiko@sntech.de>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 9356add..d5406f2 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -118,6 +118,7 @@
 obj-$(CONFIG_FB_MAXINE)		  += maxinefb.o
 obj-$(CONFIG_FB_METRONOME)        += metronomefb.o
 obj-$(CONFIG_FB_BROADSHEET)       += broadsheetfb.o
+obj-$(CONFIG_FB_AUO_K190X)	  += auo_k190x.o
 obj-$(CONFIG_FB_S1D13XXX)	  += s1d13xxxfb.o
 obj-$(CONFIG_FB_SH7760)		  += sh7760fb.o
 obj-$(CONFIG_FB_IMX)              += imxfb.o