Added LSU integrity checking.

Created by: silabs-oysteink

LSU will signal intergrity_err_o (fans into alert_major_o) immediately when any parity error on data_gnt_i or data_rvalid_i is detected. Similarly for errors on data_rchk_i, an integrity_err_o will be flagged if cpuctrl.integrity is set and the transaction is from a PMA region with integrity enabled.

Any load or store with integrity errors as described above will generate an NMI.

Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com