mb/google/volteer: add ec device entry to devicetree

BUG=b:154279851
TEST=none

Change-Id: Ibb56d97d5180ab199c52119135f7eff265908667
Signed-off-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40494
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
index 2937bbd..8a6bcf3 100644
--- a/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/volteer/variants/baseboard/devicetree.cb
@@ -348,8 +348,11 @@
 				device spi 0 on end
 			end # FPMCU
 		end # GSPI1				0xA0AB
-
-		device pci 1f.0 on  end # eSPI				0xA080 - A09F
+		device pci 1f.0 on
+			chip ec/google/chromeec
+				device pnp 0c09.0 on end
+			end
+		end # eSPI				0xA080 - A09F
 		device pci 1f.1 off end # P2SB				0xA0A0
 		device pci 1f.2 on  end # PMC				0xA0A1
 		device pci 1f.3 on