Bluetooth: Mesh: Disable randomization on Link Close in RPR server

Disable randomization at the access layer in the Remote Provisioning
server when sending Link Stauts message as a responce on Link Close
message and then sending Link Report message right after it. Because of
the randomization, the report message is sent before the status message
which makes MESH/SR/RPR/PDU/BV-03-C test to fail.

This fixes MESH/SR/RPR/PDU/BV-03-C test.

Signed-off-by: Pavel Vasilyev <pavel.vasilyev@nordicsemi.no>