staging: vchiq_arm: Drop unnecessary declarations

These declarations are left from cleanups and not necessary
anymore. So we can drop them.

Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://lore.kernel.org/r/20240621131958.98208-5-wahrenst@gmx.net


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