Implement HAL_PhysInfo. Other misc tweaks.
Detail: s/Top - Added HAL_PhysInfo implementation. Tweaked HAL_Reset to reduce chances of failure. s/Stubs - Removed obsolete, unused UART stubs. Use KbdFlag_Done instead of magic number. Admin: Tested on Raspberry Pi Version 0.23. Tagged as 'BCM2835-0_23'
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