uboot-phytec

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>