staging: vc04_services: add missing __user annotations

This patch fixes the following sparse warnings by adding missing __user
annotations. It also cleans up two related unnecessary casts by reuseing
casts already made a few lines up. Remaining sparse warnings are of a
different type.

vchiq_arm.c:1606:14: warning: incorrect type in assignment (different address spaces)
vchiq_arm.c:1606:14:    expected struct vchiq_queue_message *args
vchiq_arm.c:1606:14:    got void [noderef] <asn:1> *

vchiq_arm.c:1612:13: warning: incorrect type in argument 1 (different address spaces)
vchiq_arm.c:1612:13:    expected void const volatile [noderef] <asn:1> *
vchiq_arm.c:1612:13:    got unsigned int *

vchiq_arm.c:1613:13: warning: incorrect type in argument 1 (different address spaces)
vchiq_arm.c:1613:13:    expected void const volatile [noderef] <asn:1> *
vchiq_arm.c:1613:13:    got unsigned int *

vchiq_arm.c:1614:13: warning: incorrect type in argument 1 (different address spaces)
vchiq_arm.c:1614:13:    expected void const volatile [noderef] <asn:1> *
vchiq_arm.c:1614:13:    got struct vchiq_element const [noderef] <asn:1> **

vchiq_arm.c:1638:21: warning: incorrect type in argument 1 (different address spaces)
vchiq_arm.c:1638:21:    expected void const volatile [noderef] <asn:1> *
vchiq_arm.c:1638:21:    got struct vchiq_element const [noderef] <asn:1> **

Signed-off-by: Jasminko Dedic <betelge@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>