cpufreq: CPPC: Reuse caps variable in few routines

The 'caps' variable has been defined in cppc_cpufreq_khz_to_perf() and
cppc_cpufreq_perf_to_khz() routines, so there is no need to get
'highest_perf' value through 'cpu->caps.highest_perf', we can use
'caps->highest_perf' instead.
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
[ Viresh: Updated commit log ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

drivers/cpufreq/cppc_cpufreq.c

@@ -115,7 +115,7 @@ static unsigned int cppc_cpufreq_perf_to_khz(struct cppc_cpudata *cpu,
 		if (!max_khz)
 			max_khz = cppc_get_dmi_max_khz();
 		mul = max_khz;
-		div = cpu->perf_caps.highest_perf;
+		div = caps->highest_perf;
 	}
 	return (u64)perf * mul / div;
 }
@@ -138,7 +138,7 @@ static unsigned int cppc_cpufreq_khz_to_perf(struct cppc_cpudata *cpu,
 	} else {
 		if (!max_khz)
 			max_khz = cppc_get_dmi_max_khz();
-		mul = cpu->perf_caps.highest_perf;
+		mul = caps->highest_perf;
 		div = max_khz;
 	}