VMCI: dma dg: register dummy IRQ handlers for DMA datagrams

VMCI: dma dg: register dummy IRQ handlers for DMA datagrams

BugLink: https://bugs.launchpad.net/bugs/1978145
Register dummy interrupt handlers for DMA datagrams in preparation for
DMA datagram receive operations.

Reviewed-by: Vishnu Dasa <vdasa@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Link: https://lore.kernel.org/r/20220207102725.2742-6-jhansen@vmware.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit cc68f2177fcbfe2dbe5e9514789b96ba5995ec1e)
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Khaled Elmously <khalid.elmously@canonical.com>
Acked-by: Cengiz Can <cengiz.can@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>