staging: vc04_services: Replace VCHI_INSTANCE_T with struct vhci_instance_handle

Replaces VCHI_INSTANCE_T typedef with struct vchi_instance_handle to
match kernel code style. Issue found by checkpatch.

Signed-off-by: Jamal Shareef <jamal.k.shareef@gmail.com>
Link: https://lore.kernel.org/r/0b481a90b8a2b9cd6718e972dab681854ff312d7.1572994235.git.jamal.k.shareef@gmail.com


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