platform/chrome: chromeos_laptop: Add Leon Touch

Add support for Leon touch devices, which is the same as
slippy/falco/peppy/wolf on the same buses using the LynxPoint-LP I2C via
the i2c-designware-pci driver.

Based on the following patch:
https://chromium-review.googlesource.com/#/c/168351/Signed-off-by: Gene Chen <gene.chen@intel.com>
Reviewed-by: Benson Leung <bleung@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

drivers/platform/chrome/chromeos_laptop.c

@@ -494,6 +494,13 @@ static struct chromeos_laptop cr48 = {
 	},
 };
 
+static struct chromeos_laptop leon = {
+	.i2c_peripherals = {
+		/* Touchpad. */
+		{ .add = setup_cyapa_tp, I2C_ADAPTER_DESIGNWARE_0 },
+	},
+};
+
 #define _CBDD(board_) \
 	.callback = chromeos_laptop_dmi_matched, \
 	.driver_data = (void *)&board_
@@ -581,6 +588,14 @@ static struct dmi_system_id chromeos_laptop_dmi_table[] __initdata = {
 		},
 		_CBDD(cr48),
 	},
+	{
+		.ident = "Leon",
+		.matches = {
+			DMI_MATCH(DMI_BIOS_VENDOR, "coreboot"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Leon"),
+		},
+		_CBDD(leon),
+	},
 	{ }
 };
 MODULE_DEVICE_TABLE(dmi, chromeos_laptop_dmi_table);