cpufreq: amd-pstate: remove unused variable nominal_freq

removed the unused variable `nominal_freq` for build warning.
This variable was defined and assigned a value in the previous code,
but it was not used in the subsequent code.

Closes: https://lore.kernel.org/oe-kbuild-all/202405080431.BPU6Yg9s-lkp@intel.com/Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Perry Yuan <perry.yuan@amd.com>
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/b7ef41557f71d40d098393ddb27f0fe1f23648ae.1718811234.git.perry.yuan@amd.comSigned-off-by: Mario Limonciello <mario.limonciello@amd.com>

drivers/cpufreq/amd-pstate.c

@@ -947,7 +947,7 @@ static int amd_pstate_init_freq(struct amd_cpudata *cpudata)
 
 static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
 {
-	int min_freq, max_freq, nominal_freq, ret;
+	int min_freq, max_freq, ret;
 	struct device *dev;
 	struct amd_cpudata *cpudata;
 
@@ -978,7 +978,6 @@ static int amd_pstate_cpu_init(struct cpufreq_policy *policy)
 
 	min_freq = READ_ONCE(cpudata->min_freq);
 	max_freq = READ_ONCE(cpudata->max_freq);
-	nominal_freq = READ_ONCE(cpudata->nominal_freq);
 
 	policy->cpuinfo.transition_latency = amd_pstate_get_transition_latency(policy->cpu);
 	policy->transition_delay_us = amd_pstate_get_transition_delay_us(policy->cpu);
@@ -1398,7 +1397,7 @@ static bool amd_pstate_acpi_pm_profile_undefined(void)
 
 static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
 {
-	int min_freq, max_freq, nominal_freq, ret;
+	int min_freq, max_freq, ret;
 	struct amd_cpudata *cpudata;
 	struct device *dev;
 	u64 value;
@@ -1431,7 +1430,6 @@ static int amd_pstate_epp_cpu_init(struct cpufreq_policy *policy)
 
 	min_freq = READ_ONCE(cpudata->min_freq);
 	max_freq = READ_ONCE(cpudata->max_freq);
-	nominal_freq = READ_ONCE(cpudata->nominal_freq);
 
 	policy->cpuinfo.min_freq = min_freq;
 	policy->cpuinfo.max_freq = max_freq;