OMAP: DSS2: FEATURES: Functions to return min and max values of parameters

Create 2 functions dss_feat_get_param_min() and dss_feat_get_param_max() which
return the minimum and maximum value of a parameter. Introduce a enum in
dss_features called dss_range_param which contains parameters whose ranges we
are interested in.

Replace this with dss_feat_get_max_dss_fck() which is specific to the parameter
DSS_FCK.

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 06ad312..562d8d2 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -457,7 +457,7 @@
 
 	prate = dss_get_dpll4_rate();
 
-	max_dss_fck = dss_feat_get_max_dss_fck();
+	max_dss_fck = dss_feat_get_param_max(FEAT_PARAM_DSS_FCK);
 
 	fck = dss_clk_get_rate(DSS_CLK_FCK);
 	if (req_pck == dss.cache_req_pck &&