cpufreq: clean up dead code in Kconfig

cpufreq: clean up dead code in Kconfig

There is already an 'if CPU_FREQ' condition wrapping these config
options, making the 'depends on' statement for each a duplicate
dependency (dead code).

Leave the outer 'if CPU_FREQ...endif' and remove the individual
'depends on' statement from each option.

This dead code was found by kconfirm, a static analysis tool for
Kconfig.

Signed-off-by: Julian Braha <julianbraha@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[ rjw: Subject and changelog edits ]
Link: https://patch.msgid.link/20260331074242.39986-1-julianbraha@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>