staging: vc04_services: Replace VCHIQ_PLATFORM_STATE_T typedef with struct opaque_platform_state

Replace VCHIQ_PLATFORM_STATE_T typedef with struct opaque_platform_state
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/ed1a877637a53881ed65dc232da04dc40fbd9fc3.1572994235.git.jamal.k.shareef@gmail.com


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