OMAP: DSS2: Display Subsystem Driver core

The core files of DSS2. DSS2 commits are split a bit artificially to
make the individual commits smaller, and DSS2 doesn't compile properly
without the rest of the core commits. This shouldn't be a problem, as no
configuration uses DSS2 yet.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>
diff --git a/drivers/video/omap2/Kconfig b/drivers/video/omap2/Kconfig
index ac8b650..55b4c42 100644
--- a/drivers/video/omap2/Kconfig
+++ b/drivers/video/omap2/Kconfig
@@ -3,3 +3,5 @@
 
 config OMAP2_VRFB
 	bool
+
+source "drivers/video/omap2/dss/Kconfig"