staging: vchiq: Get rid of unnecessary definitions in vchiq_if.h

Those functions don't actually exist, nor have any use, nor the macros.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/20200629150945.10720-38-nsaenzjulienne@suse.de


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