Added diag_dc. Renamed diag_dat into diag_init.

libraries/base/diag/hdllib.cfg

libraries/base/diag/src/vhdl/diag_frm_generator.vhd

libraries/base/diag/src/vhdl/diag_tx_frm.vhd

libraries/base/diag/src/vhdl/diag_tx_seq.vhd

libraries/base/diag/src/vhdl/mms_diag_tx_seq.vhd

libraries/base/diag/tb/vhdl/tb_diag_tx_frm.vhd