cpufreq: conservative: fix load in fast_dbs_update()

driver inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7DJU2


CVE: NA

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Remove "dbs_update(policy)" for getting load in fast_dbs_update(),
incoming load from cs_dbs_update().

Reason:
Load results are inaccurate after two consecutive updates, resulting
in inaccurate frequency scaling.

Fixes: 75704b66 ("cpufreq: conservative: Add a switch to enable fast mode")
Signed-off-by: Xue Sinian <xuesinian@huawei.com>