staging: vchiq_arm: remove global 'vchiq_states' array

Remove global 'vchiq_states' array, which is not used anymore.

This is part of an effort to address TODO item "Get rid of all non
essential global structures and create a proper per device structure"

Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Adrien Thierry <athierry@redhat.com>
Link: https://lore.kernel.org/r/20220518191126.60396-10-athierry@redhat.com


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