Input: atmel_mxt_ts: Add touchscreen support for Chromebooks with upstream coreboot

Chromebooks use coreboot for system initialization. coreboot has always had the default mainboard vendor string for Google machines set to "Google". Google engineers set this string to "GOOGLE" for the coreboot copy within their Chromium OS tree. The atmel_mxt_ts driver in its current state is set to match the latter case; it will only bind to a Chromebook's touchscreen either if the device uses the vendor coreboot firmware (providing the matching mainboard vendor string), or if a user running upstream coreboot has manually set the string to "GOOGLE". Let's add a match for coreboot's default.

---
 drivers/input/touchscreen/atmel_mxt_ts.c | 8 ++++++++
 1 file changed, 8 insertions(+)

index 7659bc48f1db..43d1ea4145d7 100644
@@ -3038,6 +3038,14 @@ static const struct dmi_system_id mxt_dmi_table[] = {
 		},
 		.driver_data = chromebook_platform_data,
 	},
+	{
+		/* Chromebooks with a custom coreboot version */
+		.ident = "Chromebook",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Google"),
+		},
+		.driver_data = chromebook_platform_data,
+	},
 	{ }
 };
 

2.15.1