Dave Allie 67da8139b3 Use 6x8kB chunks instead of 1x48kB chunk for secondary display buffer (#36) ...

## Summary

- When allocating the `bwBuffer` required to restore the RED RAM in the
EPD, we were previously allocating the whole frame buffer in one
contiguous memory chunk (48kB)
- Depending on the state of memory fragmentation at the time of this
call, it may not be possible to allocate all that memory
- Instead, we now allocate 6 blocks of 8kB instead of the full 48kB,
this should mean the display updates are more resilient to different
memory conditions

## Additional Context

2025-12-17 01:39:22 +11:00

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