cpufreq: conservative: Simplify frequency limit handling

cs_dbs_update() performs explicit checks against policy->min/max
before updating the target frequency. These checks are redundant as
__cpufreq_driver_target() already clamps the requested frequency to
the valid policy limits.

Remove the unnecessary boundary checks and simplify the update logic.

This also fixes an issue introduced by commit 00bfe05889e9 ("cpufreq:
conservative: Decrease frequency faster for deferred updates"), where
stale target comparisons could cause frequency updates to be skipped
entirely after deferred adjustments.

Closes: https://lore.kernel.org/all/20260421123545.1745998-1-zhenglifeng1@huawei.com/
Fixes: 00bfe05889e9 ("cpufreq: conservative: Decrease frequency faster for deferred updates")
Signed-off-by: Lifeng Zheng <zhenglifeng1@huawei.com>
Co-developed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Zhongqiu Han <zhongqiu.han@oss.qualcomm.com>
Link: https://patch.msgid.link/292e6d937890f135e30ec0d2107eaad47cb9a976.1779423281.git.viresh.kumar@linaro.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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