soc/intel/alderlake: Add EPP override support

This updates energy performance preference value to all logical CPUs
when the corresponding chip config is true.

BUG=b:219785001
BRANCH=firmware-brya-14505.B

Signed-off-by: Cliff Huang <cliff.huang@intel.corp-partner.google.com>
Change-Id: Ie59623fe715b0c545f8d4b6c22ab2ce670a29798
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62654
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

src/soc/intel/alderlake/chip.h

@@ -559,6 +559,10 @@ struct soc_intel_alderlake_config {
 	 * 0: Fast/2, 1: Fast/4, 2: Fast/8, 3: Fast/16; see enum slew_rate for values
 	 */
 	uint8_t SlowSlewRate[NUM_VR_DOMAINS];
+
+	/* Energy-Performance Preference (HWP feature) */
+	bool enable_energy_perf_pref;
+	uint8_t energy_perf_pref_value;
 };
 
 typedef struct soc_intel_alderlake_config config_t;