vendorcode/intel/Kconfig: Hide UDK_VERSION when unneeded

This cleans .config from unused UDK_VERSION's symbol.

Change-Id: I2a17db711f615d388dbd964f67ff2cc7875c54fb
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34536
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/vendorcode/intel/Kconfig

@@ -28,6 +28,7 @@ config UDK_2015_BINDING
 config UDK_2017_BINDING
 	def_bool n
 
+if (UEFI_2_4_BINDING || UDK_2015_BINDING || UDK_2017_BINDING)
 config UDK_2013_VERSION
 	int
 	default 2013
@@ -47,3 +48,4 @@ config UDK_VERSION
 	default UDK_2013_VERSION
 	help
 	  UEFI Development Kit version for Platform
+endif # {UEFI,UDK}_BINDING