mb/google/nissa/uldren: Configure the external V1p05/Vnn/VnnSx

This patch configures external V1p05/Vnn/VnnSx rails for Uldren
to follow best practices for power savings – untested though.

* Enable the external V1p05, Vnn, VnnSx rails in S0i1, S0i2, S0i3, S3,
  S4, S5 , S0 states.
* Set the supported voltage states.
* Set the voltage for v1p05 and vnn.
* Set the ICC max for v1p05 and vnn.

BUG=b:272829190
BRANCH=firmware-nissa-15217.B
TEST=emerge-nissa coreboot

Change-Id: I3ff8e7db33bfbe4048327825406462262e8d2919
Signed-off-by: Dtrain Hsu <dtrain_hsu@compal.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74335
Reviewed-by: Derek Huang <derekhuang@google.com>
Reviewed-by: John Su <john_su@compal.corp-partner.google.com>
Reviewed-by: Ian Feng <ian_feng@compal.corp-partner.google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/variants/uldren/overridetree.cb

@@ -25,6 +25,21 @@ chip soc/intel/alderlake
 		[PchSerialIoIndexI2C5] = PchSerialIoPci,
 	}"
 
+	# Configure external V1P05/Vnn/VnnSx Rails
+	register "ext_fivr_settings" = "{
+		.configure_ext_fivr = 1,
+		.v1p05_enable_bitmap = FIVR_ENABLE_ALL_SX & ~FIVR_ENABLE_S0,
+		.vnn_enable_bitmap = FIVR_ENABLE_ALL_SX,
+		.vnn_sx_enable_bitmap = FIVR_ENABLE_ALL_SX,
+		.v1p05_supported_voltage_bitmap = FIVR_VOLTAGE_NORMAL,
+		.vnn_supported_voltage_bitmap = FIVR_VOLTAGE_MIN_ACTIVE,
+		.v1p05_voltage_mv = 1050,
+		.vnn_voltage_mv = 780,
+		.vnn_sx_voltage_mv = 1050,
+		.v1p05_icc_max_ma = 500,
+		.vnn_icc_max_ma = 500,
+	}"
+
 	# Intel Common SoC Config
 	#+-------------------+---------------------------+
 	#| Field             |  Value                    |