mb/google/rex: Add fingerprint SPI

Add Fingerprint SPI, and power-off FPMCU during romstage.
For reference see CL:66915 for a similar change to Brya's power sequence
SHA: 2b523ce6316e5c5ec86fe812d739fe48ca81d83d ("Invoke power cycle of
FPMCU on startup")

TEST=Tested on Rex - setup and logged in using fingerprint

Change-Id: I4e6be24e72a8232ae2c958a01cf8ea9a272d7365
Signed-off-by: Eran Mitrani <mitrani@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/66992
Reviewed-by: Tarun Tuli <taruntuli@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
diff --git a/src/mainboard/google/rex/variants/rex0/gpio.c b/src/mainboard/google/rex/variants/rex0/gpio.c
index 541402c..c90c0c1 100644
--- a/src/mainboard/google/rex/variants/rex0/gpio.c
+++ b/src/mainboard/google/rex/variants/rex0/gpio.c
@@ -432,8 +432,12 @@
 };
 
 static const struct pad_config romstage_gpio_table_id0[] = {
-	/* A20  : [] ==> SSD_PERST_L */
+	/* GPP_B11 : [] ==> EN_FP_PWR */
+	PAD_CFG_GPO(GPP_B11, 0, DEEP),
+	/* A20 : [] ==> SSD_PERST_L */
 	PAD_CFG_GPO(GPP_A20, 0, DEEP),
+	/* GPP_C23 : [] ==> FP_RST_ODL */
+	PAD_CFG_GPO(GPP_C23, 0, DEEP),
 	/* GPP_E07 : [] ==> WWAN_FCPO_L */
 	PAD_CFG_GPO(GPP_E07, 1, DEEP),
 };