ACPI: CPPC: Rename EPP constants for clarity

Update EPP (Energy Performance Preference) constants for more clarity:

 - Add CPPC_EPP_PERFORMANCE_PREF (0x00) for performance preference.

 - Rename CPPC_ENERGY_PERF_MAX to CPPC_EPP_ENERGY_EFFICIENCY_PREF (0xFF)
   for energy efficiency.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
Reviewed-by: Lifeng Zheng <zhenglifeng1@huawei.com>
[ rjw: Changelog edits ]
Link: https://patch.msgid.link/20260120145623.2959636-4-sumitg@nvidia.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
(cherry picked from commit 83e2908 linux-next)
Signed-off-by: Jamie Nguyen <jamien@nvidia.com>

Author: Sumit Gupta

drivers/acpi/cppc_acpi.c

@@ -1636,7 +1636,7 @@ EXPORT_SYMBOL_GPL(cppc_set_epp_perf);
  */
 int cppc_set_epp(int cpu, u64 epp_val)
 {
-	if (epp_val > CPPC_ENERGY_PERF_MAX)
+	if (epp_val > CPPC_EPP_ENERGY_EFFICIENCY_PREF)
 		return -EINVAL;
 
 	return cppc_set_reg_val(cpu, ENERGY_PERF, epp_val);

include/acpi/cppc_acpi.h

@@ -39,7 +39,8 @@
 /* CPPC_AUTO_ACT_WINDOW_MAX_SIG is 127, so 128 and 129 will decay to 127 when writing */
 #define CPPC_AUTO_ACT_WINDOW_SIG_CARRY_THRESH 129
 
-#define CPPC_ENERGY_PERF_MAX	(0xFF)
+#define CPPC_EPP_PERFORMANCE_PREF		0x00
+#define CPPC_EPP_ENERGY_EFFICIENCY_PREF		0xFF
 
 #define CPPC_PERF_LIMITED_DESIRED_EXCURSION	BIT(0)
 #define CPPC_PERF_LIMITED_MINIMUM_EXCURSION	BIT(1)