s390/uv_uapi: depend on CONFIG_S390

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Author: bonzini

drivers/s390/char/Kconfig

@@ -103,6 +103,7 @@ config SCLP_OFB
 config S390_UV_UAPI
 	def_tristate m
 	prompt "Ultravisor userspace API"
+	depends on S390
 	help
 	  Selecting exposes parts of the UV interface to userspace
 	  by providing a misc character device at /dev/uv.