OMAPDSS: DSI: rename clkin4ddr to clkdco

We are creating a common DSS PLL code, so rename 'clkin4ddr' field,
which is DSI specific name, to 'clkdco' which is a generic name.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

diff --cc drivers/video/fbdev/omap2/dss/dpi.c
Simple merge

diff --cc drivers/video/fbdev/omap2/dss/dsi.c
Simple merge

diff --cc drivers/video/fbdev/omap2/dss/dss.h
Simple merge