Minor fixes and improvements for Kitty

[Ivan-Velickovic]

• VM should not have as many things passed through
• DTS for guest should use overlay instead
• UI updates are still too slow, can't tell if performance with redraws is still too bad or due to delay of tapping cards
• Use I2C bus helpers
• Improve font/font resolution in UI
• UI framebuffer should use a memoryview provided by the VMM instead
• Odroid-C4 Screen flickering should be investigated/at least documented
• Client does not seem to work with phone cards/Apple pay etc
• Cat picture currently gets cut off a bit when the UI is reset
• Resolve all serial issues (CTRL + D also crashes). Also the REPL in MicroPython by default auto-restarts I think or has a way to auto-restart so we should remove our code for this in micropython.c.
  * [ ] Use default NFS server/dir for people who don't have it setup? will use FATFS file system for QEMU later on.
• CTRL+C does not interrupt execution
• I2C buffer sizes should be small - we should amend the sDDF I2C example as well.
• Submodules should be initialised with the Makefile since not all of deps/ needs to be initialised for Kitty. This should be documented as well on lionsos.org.
• Remove all @alwin notes.
• Improve i2c stability.
• [ ]

[Kswin01]

* [ ]  Use default NFS server/dir for people who don't have it setup?

This point doesn't seem beneficial outside of internal TS work.

[Ivan-Velickovic]

* [ ]  Use default NFS server/dir for people who don't have it setup?

This point doesn't seem beneficial outside of internal TS work.

The description is poor but I meant that people who do not have an NFS server setup should not have to set the Makefile config.