platform: chrome: Add input dependency for tablet switch driver

Without CONFIG_INPUT, or with a modular input layer and built-in
tablet driver, we get a link error:

ERROR: "input_event" [drivers/platform/chrome/chromeos_tbmc.ko] undefined!
ERROR: "input_register_device" [drivers/platform/chrome/chromeos_tbmc.ko] undefined!
ERROR: "input_set_capability" [drivers/platform/chrome/chromeos_tbmc.ko] undefined!
ERROR: "devm_input_allocate_device" [drivers/platform/chrome/chromeos_tbmc.ko] undefined!

This adds the corresponding Kconfig dependency

Fixes: b418f741 ("platform: chrome: Add Tablet Switch ACPI driver")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Benson Leung <bleung@chromium.org>

drivers/platform/chrome/Kconfig

@@ -41,6 +41,7 @@ config CHROMEOS_PSTORE
 config CHROMEOS_TBMC
 	tristate "ChromeOS Tablet Switch Controller"
 	depends on ACPI
+	depends on INPUT
 	help
 	  This option adds a driver for the tablet switch on
 	  select Chrome OS systems.