clk: versaclock3: convert from divider_round_rate() to divider_determine_rate()

The divider_round_rate() function is now deprecated, so let's migrate
to divider_determine_rate() instead so that this deprecated API can be
removed.

Note that when the main function itself was migrated to use
determine_rate, this was mistakenly converted to:

    req->rate = divider_round_rate(...)

This is invalid in the case when an error occurs since it can set the
rate to a negative value.

Fixes: 9e3372b ("clk: versaclock3: convert from round_rate() to determine_rate()")
Signed-off-by: Brian Masney <bmasney@redhat.com>

Author: masneyb

drivers/clk/clk-versaclock3.c

@@ -523,11 +523,8 @@ static int vc3_div_determine_rate(struct clk_hw *hw,
 		return 0;
 	}
 
-	req->rate = divider_round_rate(hw, req->rate, &req->best_parent_rate,
-				       div_data->table,
-				       div_data->width, div_data->flags);
-
-	return 0;
+	return divider_determine_rate(hw, req, div_data->table, div_data->width,
+				      div_data->flags);
 }
 
 static int vc3_div_set_rate(struct clk_hw *hw, unsigned long rate,