RDMA/bnxt_re: Avoid CPU lockups due fifo occupancy check loop

In the Linux kernel, the following vulnerability has been resolved:

RDMA/bnxt_re: Avoid CPU lockups due fifo occupancy check loop

Driver waits indefinitely for the fifo occupancy to go below a threshold

as soon as the pacing interrupt is received. This can cause soft lockup on

one of the processors, if the rate of DB is very high.

Add a loop count for FPGA and exit the __wait_for_fifo_occupancy_below_th

if the loop is taking more time. Pacing will be continuing until the

occupancy is below the threshold. This is ensured by the checks in

bnxt_re_pacing_timer_exp and further scheduling the work for pacing based

on the fifo occupancy.