platform/surface: Move Surface Pro 3 Button driver to platform/surface

Move the Surface Pro 3 Button driver from platform/x86 to the newly
created platform/surface directory.

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Chen Yu <yu.c.chen@intel.com>
Link: https://lore.kernel.org/r/20201009141128.683254-6-luzmaximilian@gmail.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig
index ac1c749..10902ea 100644
--- a/drivers/platform/surface/Kconfig
+++ b/drivers/platform/surface/Kconfig
@@ -40,4 +40,10 @@
 	  This driver provides support for ACPI operation
 	  region of the Surface 3 battery platform driver.
 
+config SURFACE_PRO3_BUTTON
+	tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet"
+	depends on ACPI && INPUT
+	help
+	  This driver handles the power/home/volume buttons on the Microsoft Surface Pro 3/4 tablet.
+
 endif # SURFACE_PLATFORMS