util/mb/google/puff: remove HECI from overridetree

The template for overridetree.cb includes HeciEnabled, which has
been removed from the CNL config struct, so remove it from the
overridetree.

BUG=b:174360951
TEST=`new_variant_fulltest.sh puff` succeeds

Signed-off-by: Paul Fagerburg <pfagerburg@google.com>
Change-Id: I87f67c53cc75d9ddd40b4960739180a95de6ecd6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48129
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
diff --git a/util/mainboard/google/puff/template/overridetree.cb b/util/mainboard/google/puff/template/overridetree.cb
index adb00e4..a30dad0 100644
--- a/util/mainboard/google/puff/template/overridetree.cb
+++ b/util/mainboard/google/puff/template/overridetree.cb
@@ -1,7 +1,4 @@
 chip soc/intel/cannonlake
-	# Enable heci communication
-	register "HeciEnabled" = "1"
-
 	# Auto-switch between X4 NVMe and X2 NVMe.
 	register "TetonGlacierMode" = "1"