UPSTREAM: x86/uaccess: fix sparse errors

virtio wants to read bitwise types from userspace using get_user.  At the
moment this triggers sparse errors, since the value is passed through an
integer.

Fix that up using __force.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>

Change-Id: Ife0f1635cea5afb006dc57e99e6dd616b6ae8c34
(cherry picked from commit e182c570e9953859aee5cb016583217d9e68ea18)
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>