x86: add MULTIUSER dependency for KVM

BugLink: http://bugs.launchpad.net/bugs/1756866

commit c2ce3f5d upstream.

KVM tries to select 'TASKSTATS', which had additional dependencies:

warning: (KVM) selects TASKSTATS which has unmet direct dependencies (NET && MULTIUSER)
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

arch/x86/kvm/Kconfig

@@ -22,7 +22,7 @@ config KVM
 	depends on HAVE_KVM
 	depends on HIGH_RES_TIMERS
 	# for TASKSTATS/TASK_DELAY_ACCT:
-	depends on NET
+	depends on NET && MULTIUSER
 	select PREEMPT_NOTIFIERS
 	select MMU_NOTIFIER
 	select ANON_INODES