RQ-4 violation in HCI-FIFO when incoming stream-FIFO becomes full concurrently to a non-granted request

[FrancescoConti]

If incoming_fifo_not_full makes a 1->0 transition in the cycle after a non-granted request (req=1, gnt=0), tcdm_master.req will go down, causing a RQ-4 protocol violation (NORETIRE).
This should be harmless in theory, but should still be fixed in a future commit.

[FrancescoConti]