Refactor early GPU queries
Remove the baffling double indirection of RamAd (and unused exports SerNo and MacAdd), and treat these the same as the other pre-HAL_Init query results. This means the scope of the tagbuffer is limited to Messaging.s, rather than having to be kept preserved globally. Use memcpy() to copy tag list to tagbuffer for clarity. Tested on a Pi 3. Version 0.68. Tagged as 'BCM2835-0_68'
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