OMAP: DSS2: DSI: Fix DSI PLL power bug

OMAP3630 has a HW bug causing DSI PLL power command POWER_ON_DIV (0x3)
to not work properly. The bug prevents us from enabling DSI PLL power
only to HS divider block.

This patch adds a dss feature for the bug and converts POWER_ON_DIV
requests to POWER_ON_ALL (0x2).

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/dss_features.h b/drivers/video/omap2/dss/dss_features.h
index 12e9c4e..37922ce 100644
--- a/drivers/video/omap2/dss/dss_features.h
+++ b/drivers/video/omap2/dss/dss_features.h
@@ -40,6 +40,8 @@
 	/* Independent core clk divider */
 	FEAT_CORE_CLK_DIV	= 1 << 11,
 	FEAT_LCD_CLK_SRC	= 1 << 12,
+	/* DSI-PLL power command 0x3 is not working */
+	FEAT_DSI_PLL_PWR_BUG	= 1 << 13,
 };
 
 /* DSS register field id */