soc/intel/alderlake: Set LpmStateEnableMask UPD

Use the get_supported_lpm_states() function to set the respective FSP
UPD.

TEST=with patchtrain on brya0,
/sys/kernel/debug/pmc_core/substate_requirements shows only the
substates that are applicable to the design (S0i2.0, S0i3.0).

Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: I5bb8b3671e78c5f2706db2d3a21b25cf90a14275
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56458
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/soc/intel/alderlake/cpu.c

@@ -188,3 +188,18 @@ enum adl_cpu_type get_adl_cpu_type(void)
 
 	return ADL_UNKNOWN;
 }
+
+uint8_t get_supported_lpm_mask(void)
+{
+	enum adl_cpu_type type = get_adl_cpu_type();
+	switch (type) {
+	case ADL_M: /* fallthrough */
+	case ADL_P:
+		return LPM_S0i2_0 | LPM_S0i3_0;
+	case ADL_S:
+		return LPM_S0i2_0 | LPM_S0i2_1;
+	default:
+		printk(BIOS_ERR, "Unknown ADL CPU type: %d\n", type);
+		return 0;
+	}
+}