Updating dependencies and add DwtTimer

[haata]

• Add DwtTimer for use with rtic
  • Useful for defmt timestamps
  • Requires fugit and fugit-timer
• Update dependencies
  • cast -> 0.3.0
  • cortex-m -> 0.7.5
  • embedded-dma -> 0.2.0
  • embedded-hal -> 0.2.7
  • embedded-storage -> 0.3.0
  • embedded-time -> 0.12.1
  • nb -> 1.0.0
  • volatile -> 0.4.5
  • pac crates -> 0.2.1
• Remove deprecated defmt- features (no longer used as of defmt 0.3)
• Fix embedded-storage api
• Fix embedded-dma api
• Updated edition to 2021
• Increment version