HACK: OMAP: DSS2: clk hack for OMAP2/3

The HWMOD data for OMAP2 and 3 are currently not up to date regarding
DSS (OMAP4 HWMOD data is fine). This patch makes the DSS driver to get
the opt clocks needed for OMAP2/3 with the old clock names, thus
allowing DSS driver to use runtime PM.

The HWMOD databases should be fixes ASAP, and this patch can be reverted
after that.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index 48b0cdf..7adbbeb 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -4435,7 +4435,10 @@
 
 	dsi->dss_clk = clk;
 
-	clk = clk_get(&dsidev->dev, "sys_clk");
+	if (cpu_is_omap34xx() || cpu_is_omap3630())
+		clk = clk_get(&dsidev->dev, "dss2_alwon_fck");
+	else
+		clk = clk_get(&dsidev->dev, "sys_clk");
 	if (IS_ERR(clk)) {
 		DSSERR("can't get sys_clk\n");
 		clk_put(dsi->dss_clk);