dell-wmi, dell-laptop: depends DMI

dell-wmi and dell-laptop will compile but won't work right if DMI
isn't selected.
Signed-off-by: NAndy Lutomirski <luto@kernel.org>
Acked-by: NPali Rohár <pali.rohar@gmail.com>

[arnd: Use depends instead of selects to avoid recursive dependencies]
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NDarren Hart <dvhart@linux.intel.com>

drivers/platform/x86/Kconfig

@@ -105,6 +105,7 @@ config DELL_LAPTOP
 	tristate "Dell Laptop Extras"
 	depends on X86
 	depends on DELL_SMBIOS
+	depends on DMI
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on ACPI_VIDEO || ACPI_VIDEO = n
 	depends on RFKILL || RFKILL = n
@@ -120,6 +121,7 @@ config DELL_LAPTOP
 config DELL_WMI
 	tristate "Dell WMI extras"
 	depends on ACPI_WMI
+	depends on DMI
 	depends on INPUT
 	depends on ACPI_VIDEO || ACPI_VIDEO = n
 	select INPUT_SPARSEKMAP