Added 'last' signal in lsu to check for last part of misaligned transfers
Created by: silabs-oysteink
Load store unit could incorrectly signal valid_1_o when the first part of a misaligned load/store was in WB.
Added a 'last_q' bit which is set to 1'b1 when the last part of a misaligned load/store goes from EX to WB.
Signed-off-by: Oystein Knauserud Oystein.Knauserud@silabs.com