cpufreq : CPPC: Break out if HiSilicon CPPC workaround is matched

Bail out if we match the OEM information, to save some possible
extra iteration.

Also update the code to fix minor coding style issue.

Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>