mainboard/msi/ms7d25: Add FIVR configuration

Reflect the vendor's firmware FIVR settings.

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Change-Id: I97b3b4f9470267961c138fea70703606373f6d52
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64051
Reviewed-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/msi/ms7d25/devicetree.cb

@@ -84,6 +84,13 @@ chip soc/intel/alderlake
 	register "hybrid_storage_mode" = "1"
 	register "dmi_power_optimize_disable" = "1"
 
+	# FIVR configuration
+	register "fivr_rfi_frequency" = "1394"
+	register "fivr_spread_spectrum" = "FIVR_SS_1_5"
+	register "ext_fivr_settings" = "{
+		.configure_ext_fivr = 1,
+	}"
+
 	device domain 0 on
 		subsystemid 0x1462 0x7d25 inherit
 		device ref pcie5_0 on