mb/google/kahlee: Fix I2C bus 1 timing for Grunt

I measured the rise and fall times for I2C bus 1 from userspace
manually, using "i2cdetect 1" called from userspace and an oscilloscope.

This commit fixes the values there to reflect reality.

BUG=b:72442912,b:70232394

Change-Id: I4f593cb2674006060cad9a77753c23f7d9828c9b
Signed-off-by: Justin TerAvest <teravest@chromium.org>
Reviewed-on: https://review.coreboot.org/23459
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Chris Ching <chingcodes@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb
index 977e32d..d2453a1 100644
--- a/src/mainboard/google/kahlee/variants/grunt/devicetree.cb
+++ b/src/mainboard/google/kahlee/variants/grunt/devicetree.cb
@@ -28,11 +28,11 @@
 		.fall_time_ns = 52,
 	}"
 
-	# TODO(teravest): Fix speeds here.
+	# Enable I2C1 for H1 at 400kHz
 	register "i2c[1]" = "{
 		.speed = I2C_SPEED_FAST,
-		.rise_time_ns = 104,
-		.fall_time_ns = 52,
+		.rise_time_ns = 84,
+		.fall_time_ns = 4,
 	}"
 
 	# TODO(teravest): Fix speeds here.