misc: vmw_vmci: Remove unused vmci_ctx functions

vmci_ctx_dbell_destroy_all() and vmci_ctx_pending_datagrams()
were added in 2013 by
commit 28d6692c ("VMCI: context implementation.")

but have remained unused.

Remove them.

Signed-off-by: "Dr. David Alan Gilbert" <linux@treblig.org>
Link: https://lore.kernel.org/r/20250614010344.636076-2-linux@treblig.org


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