staging: vchiq_arm: Remove extra struct vchiq_instance declaration

staging: vchiq_arm: Remove extra struct vchiq_instance declaration

Additional declaration of struct vchiq_instance was introduced in the
commit 726e79f8a648 ("staging: vchiq_arm: pass vchiq instance to
service callbacks"). Drop the extra declaration.

Fixes: 726e79f8a648 ("staging: vchiq_arm: pass vchiq instance to service callbacks")
Signed-off-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Link: https://lore.kernel.org/r/20221221074047.233473-1-umang.jain@ideasonboard.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>