staging: vchiq_arm: move platform structs to vchiq_arm.c

After merging vchiq_2835_arm.c into vchiq_arm.c some platform structs
doesn't need to exported anymore. So move them into the C file.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1633264369-998-4-git-send-email-stefan.wahren@i2se.com


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