clk: Remove clock ID check in .get_rate() of clk_fixed_*

This check requires the struct clk passed to .get_rate() to be always
cleared out as any clock with valid ID causes -EINVAL return value.

The return code of fixed clocks shall always be returned.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Peng Fan <peng.fan@nxp.com>

drivers/clk/clk_fixed_factor.c

@@ -24,9 +24,6 @@ static ulong clk_fixed_factor_get_rate(struct clk *clk)
 	uint64_t rate;
 	struct clk_fixed_factor *ff = to_clk_fixed_factor(clk->dev);
 
-	if (clk->id != 0)
-		return -EINVAL;
-
 	rate = clk_get_rate(&ff->parent);
 	if (IS_ERR_VALUE(rate))
 		return rate;

drivers/clk/clk_fixed_rate.c

@@ -15,9 +15,6 @@ struct clk_fixed_rate {
 
 static ulong clk_fixed_rate_get_rate(struct clk *clk)
 {
-	if (clk->id != 0)
-		return -EINVAL;
-
 	return to_clk_fixed_rate(clk->dev)->fixed_rate;
 }