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Previously we commandeered GPIO extender IO4 to be told whether eMMC is fitted
or not, and only if we're certain it is via opt-in (the line being actively
pulled low) would SDFS treat that as a fixed disc.
Unfortunately, extender IO4 is used to set 1.8V versus 3.3V signalling on the
SDIO bus - so some brands of SD card would not work as SD_VDD_override was
pulled high to 1.8V signalling when 3.3V was needed.

* Change to use the 2 word form of ARM2VC_Tag_GetBoardRevision which returns
  the extended revision word too, b31 of which gives the eMMC fit/no fit state
* Default to "safe" state of assuming removable media if the firmware is too
  old to support the 8 byte form (pre 29-Feb-2024 commit dc94391)
* For CM4 (only) ensure the state of the WiFi antenna selector is defined, by
  default choosing the on board PCB antenna and deselecting the UFL socket
* Use Push/Pull macros for function entry/exit

Version 1.04. Tagged as 'HAL_BCM2835-1_04'