Move to linux4microchip+fpga-2024.09

This MR supersedes !5 by pushing even further ahead to 6.6.51,
but I want to credit @LucienMorey for his pointers which made this work possible.

Three important points:

• The tool to import a new bitstream to the fabric will have to be replaced,
  as the mechanism in 6.6 is very different compared to 6.1.
• You will need to rebuild the fabric gateware if older than 20241104,
  as that contains changes to the DTBOs to make them compatible with both 6.1 and 6.6
• Every effort has been made to check the configs,
  nevertheless, I would appreciate it if @RobertCNelson would do another pass to be certain.

The following hardware and drivers have been sucessfully tested:

• GPIO
• PWM
• CAN
• M.2 port with WiFi module.