clk: at91: clk-generated: select absolute closest rate

To get the same behavior as the Linux driver, instead of selecting
the closest inferior rate, select the closest inferior or superior
rate

Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wenyou Yang <wenyou.yang@microchip.com>

drivers/clk/at91/clk-generated.c

@@ -98,9 +98,7 @@ static ulong generic_clk_set_rate(struct clk *clk, ulong rate)
 
 		for (div = 1; div < GENERATED_MAX_DIV + 2; div++) {
 			tmp_rate = DIV_ROUND_CLOSEST(parent_rate, div);
-			if (rate < tmp_rate)
-				continue;
-			tmp_diff = rate - tmp_rate;
+			tmp_diff = abs(rate - tmp_rate);
 
 			if (best_diff < 0 || best_diff > tmp_diff) {
 				best_rate = tmp_rate;