Motivation:
Though bitmap can have an arbitrary length, the linux 5.10 client expects
device notification bitmap to be size of one (1).

Modification:
Update OperationGETDEVICEINFO to initialize resulting notification bitmap
with the length that matches requested notification bitmap.

Result:
Linux 5.10 client processes the result of getdeviceinfo operation as expected.

Target: 0.22, master
Acked-by: Paul Millar
Acked-by: Albert Rossi
(cherry picked from commit 8ede287c

)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>