Implement HAL UART API. Tidy up debug output.
Detail: hdr/BCM2835, hdr/StaticWS, s/Debug, s/Top, s/Video - Fix up the two serial debug switches to work correctly. Disable debug by default. s/UART, hdr/UART - Implement HAL UART API, for the PL011 UART. Admin: Tested on Raspberry Pi 1 B Requires DualSerial 0.25 to work correctly Version 0.59. Tagged as 'BCM2835-0_59'
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