x86: coral: Update an unused pin to reduce power

GPIO_25 is not used on coral, so set it up in deep sleep.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/dts/chromebook_coral.dts b/arch/x86/dts/chromebook_coral.dts
index a846022..965f592 100644
--- a/arch/x86/dts/chromebook_coral.dts
+++ b/arch/x86/dts/chromebook_coral.dts
@@ -637,6 +637,7 @@
 				PAD_CFG0_TX_DISABLE | PAD_CFG0_ROUTE_IOAPIC |
 				PAD_CFG0_TRIG_LEVEL | PAD_CFG0_RX_POL_INVERT)
 			(PAD_CFG1_PULL_NONE | PAD_CFG1_IOSSTATE_TXD_RXE)
+		PAD_CFG_GPI(GPIO_25, UP_20K, DEEP)	 /* unused */
 
 		/*
 		 * WLAN_PE_RST - default to deasserted just in case FSP