Add FEC error detection/flag

The following signals have to be added:

-- Status
uplinkDataCorrected_o           : out std_logic_vector(229 downto 0);    --! Bit(s) of the data field toggled by the FEC
uplinkIcCorrected_o             : out std_logic_vector(1 downto 0);      --! Bit(s) of the IC field toggled by the FEC
uplinkEcCorrected_o             : out std_logic_vector(1 downto 0);      --! Bit(s) of the EC field toggled by the FEC

It should result of a xor between data from the decoder and data to the decoder.