cpufreq: armada-37xx: use max() to calculate target_vm

Use max() macro while calculating target_vm to simplify and improve the
armada-37xx-cpufreq driver code.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/r/[e-mail]/
Reported-by: Yang Ruibin <[e-mail]>
Closes: https://lore.kernel.org/lkml/[e-mail]/
Signed-off-by: Akhilesh Patil <[e-mail]>
Signed-off-by: Viresh Kumar <[e-mail]>

drivers/cpufreq/armada-37xx-cpufreq.c

···
 	 */
 
 	target_vm = avs_map[l0_vdd_min] - 100;
-	target_vm = target_vm > MIN_VOLT_MV ? target_vm : MIN_VOLT_MV;
+	target_vm = max(target_vm, MIN_VOLT_MV);
 	dvfs->avs[1] = armada_37xx_avs_val_match(target_vm);
 
 	/*
···
 	 * be larger than 1000mv
 	 */
 	target_vm = avs_map[l0_vdd_min] - 150;
-	target_vm = target_vm > MIN_VOLT_MV ? target_vm : MIN_VOLT_MV;
+	target_vm = max(target_vm, MIN_VOLT_MV);
 	dvfs->avs[2] = dvfs->avs[3] = armada_37xx_avs_val_match(target_vm);
 
 	/*