PM / devfreq: Fix governor_store() failing when device has no current governor

Since devfreq_remove_governor() may clear the device's current governor
in certain situations, while governors actually exist independently
of the device, directly returning EINVAL in this case is inaccurate.

To fix this issue, remove this check and add relevant logic for when
df->governor is NULL.

Fixes: 483d557ee9a3 ("PM / devfreq: Clean up the devfreq instance name in sysfs attr")
Co-developed-by: Choi Chanwoo <cwchoi00@gmail.com>
Signed-off-by: Yaxiong Tian <tianyaxiong@kylinos.cn>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://lore.kernel.org/all/20260430032035.75496-1-tianyaxiong@kylinos.cn/

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