mb/google/kahlee/treeya: Set touchpad hold time to 400ns

According to SI team request, need to tune I2C bus 2 data
hold time more than 300ns

BUG=b:144736027
TEST=build firmware and measure I2C bus 2 data hold time

Signed-off-by: Peichao Wang <peichao.wang@bitland.corp-partner.google.com>
Change-Id: Idc58a595c77eba8544f27682a284be6aac5dbe25
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36945
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Martin Roth <martinroth@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/kahlee/variants/treeya/devicetree.cb

@@ -44,6 +44,7 @@ chip soc/amd/stoneyridge
 		.speed = I2C_SPEED_FAST,
 		.rise_time_ns = 3,
 		.fall_time_ns = 2,
+		.data_hold_time_ns = 400,
 	}"
 
 	# Enable I2C3 for touchscreen at 400kHz