VMCI: dma dg: detect DMA datagram capability

Detect the VMCI DMA datagram capability, and if present, ack it
to the device.

Reviewed-by: Vishnu Dasa <vdasa@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Link: https://lore.kernel.org/r/20220207102725.2742-4-jhansen@vmware.com


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