staging: vc04_services: vchiq_arm: Fix NULL ptr dereferences

The commit 8c9753f6 ("staging: vc04_services: vchiq_arm: Drop
g_cache_line_size") introduced NULL pointer dereferences by
using the wrong device.

Fixes: 8c9753f6 ("staging: vc04_services: vchiq_arm: Drop g_cache_line_size")
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Link: https://lore.kernel.org/r/20240420091240.9552-1-wahrenst@gmx.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>