A UE might send a UE Capability Information without unsolicitatedly
(intentionally or not). Check this and handle appropriately to avoid
assertion

    Assertion (UE->xids[xid] == RRC_UECAPABILITY_ENQUIRY) failed!
    In handle_ueCapabilityInformation() ../../../openair2/RRC/NR/rrc_gNB.c

Closes: #858