msi-laptop: fix config-dependent build error

The msi-laptop driver uses input_*() and sparse_keymap_*() interfaces.
It should depend on the INPUT subsystem being present and select
INPUT_SPARSEKMAP so that those interfaces are present.

ERROR: "input_free_device" [drivers/platform/x86/msi-laptop.ko] undefined!
ERROR: "input_register_device" [drivers/platform/x86/msi-laptop.ko] undefined!
ERROR: "sparse_keymap_setup" [drivers/platform/x86/msi-laptop.ko] undefined!
ERROR: "input_allocate_device" [drivers/platform/x86/msi-laptop.ko] undefined!
ERROR: "sparse_keymap_report_event" [drivers/platform/x86/msi-laptop.ko] undefined!
ERROR: "input_unregister_device" [drivers/platform/x86/msi-laptop.ko] undefined!
ERROR: "sparse_keymap_free" [drivers/platform/x86/msi-laptop.ko] undefined!
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: "Lee, Chun-Yi" <jlee@novell.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

drivers/platform/x86/Kconfig

@@ -187,7 +187,8 @@ config MSI_LAPTOP
 	depends on ACPI
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on RFKILL
-	depends on SERIO_I8042
+	depends on INPUT && SERIO_I8042
+	select INPUT_SPARSEKMAP
 	---help---
 	  This is a driver for laptops built by MSI (MICRO-STAR
 	  INTERNATIONAL):