clk: vc5: Use clamp() to restrict PLL range

The VCO frequency needs to be within a certain range and the driver
enforces this.

Make use of the clamp macro to implement this instead of open-coding it.
This makes the code a bit shorter and also semanticly stronger.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Link: https://lore.kernel.org/r/20230114233500.3294789-1-lars@metafoo.de
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: larsclausen

drivers/clk/clk-versaclock5.c

@@ -449,10 +449,7 @@ static long vc5_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 	u32 div_int;
 	u64 div_frc;
 
-	if (rate < VC5_PLL_VCO_MIN)
-		rate = VC5_PLL_VCO_MIN;
-	if (rate > VC5_PLL_VCO_MAX)
-		rate = VC5_PLL_VCO_MAX;
+	rate = clamp(rate, VC5_PLL_VCO_MIN, VC5_PLL_VCO_MAX);
 
 	/* Determine integer part, which is 12 bit wide */
 	div_int = rate / *parent_rate;