cpufreq: Contain scaling_cur_freq.attr in cpufreq_attrs

After commit c034b02e ("cpufreq: expose scaling_cur_freq sysfs file
for set_policy() drivers"), the file scaling_cur_freq is exposed to all
drivers.

No need to create this file separately. It's better to be contained in
cpufreq_attrs.

Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Link: https://patch.msgid.link/20250623133402.3120230-4-zhenglifeng1@huawei.com


Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>