uio: remove !S390 dependency from Kconfig

Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/uio/Kconfig

 menuconfig UIO
 	tristate "Userspace I/O drivers"
-	depends on !S390
 	help
 	  Enable this to allow the userspace driver core code to be
 	  built.  This code allows userspace programs easy access to