drm/omap: rename dss_clk_source enums

The names of the enum dss_clk_source's values are legacy names, only
correct for OMAP3 DSS. Rename the names to more generic ones.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/dss/dpi.c b/drivers/gpu/drm/omapdrm/dss/dpi.c
index f2e9638..487d054 100644
--- a/drivers/gpu/drm/omapdrm/dss/dpi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dpi.c
@@ -127,15 +127,15 @@
 {
 	switch (channel) {
 	case OMAP_DSS_CHANNEL_LCD:
-		return OMAP_DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC;
+		return DSS_CLK_SRC_PLL1_1;
 	case OMAP_DSS_CHANNEL_LCD2:
-		return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
+		return DSS_CLK_SRC_PLL2_1;
 	case OMAP_DSS_CHANNEL_LCD3:
-		return OMAP_DSS_CLK_SRC_DSI2_PLL_HSDIV_DISPC;
+		return DSS_CLK_SRC_PLL2_1;
 	default:
 		/* this shouldn't happen */
 		WARN_ON(1);
-		return OMAP_DSS_CLK_SRC_FCK;
+		return DSS_CLK_SRC_FCK;
 	}
 }
 
@@ -465,7 +465,7 @@
 	dss_mgr_disable(channel);
 
 	if (dpi->pll) {
-		dss_select_lcd_clk_source(channel, OMAP_DSS_CLK_SRC_FCK);
+		dss_select_lcd_clk_source(channel, DSS_CLK_SRC_FCK);
 		dss_pll_disable(dpi->pll);
 	}