clk: imx: clk-gpr-mux: Simplify .determine_rate()

imx_clk_gpr_mux_determine_rate() is the same as __clk_mux_determine_rate(),
so use the latter to save some LoC.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/ac8bd50c41b84f244bb0ec94e8aed25c513c9037.1688760152.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>

Author: tititiou36

drivers/clk/imx/clk-gpr-mux.c

@@ -65,16 +65,10 @@ static int imx_clk_gpr_mux_set_parent(struct clk_hw *hw, u8 index)
 	return regmap_update_bits(priv->regmap, priv->reg, priv->mask, val);
 }
 
-static int imx_clk_gpr_mux_determine_rate(struct clk_hw *hw,
-					 struct clk_rate_request *req)
-{
-	return clk_mux_determine_rate_flags(hw, req, 0);
-}
-
 static const struct clk_ops imx_clk_gpr_mux_ops = {
 	.get_parent = imx_clk_gpr_mux_get_parent,
 	.set_parent = imx_clk_gpr_mux_set_parent,
-	.determine_rate = imx_clk_gpr_mux_determine_rate,
+	.determine_rate = __clk_mux_determine_rate,
 };
 
 struct clk_hw *imx_clk_gpr_mux(const char *name, const char *compatible,