[rom_ctrl] Check TL command integrity in ROM adapter
[rom_ctrl] Check TL command integrity in ROM adapter

This fixes the rom_ctrl_tl_intg_err test (where we weren't previously
spotting malformed TL commands sent to the ROM).

Signed-off-by: Rupert Swarbrick <290093e2ad2515ed2f14d749293c8cf8e02ca274@lowrisc.org>

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