Resolve issue causing second buffer not to get created

[grafail]

This is a fix for an issue caused by allocating 2 buffers in a row that seems to cause this error: MemoryError: allocation flags must be the same for both buffers

Reproduction code:

fb1 = display_bus.allocate_framebuffer(sz, lcd_bus.MEMORY_SPIRAM)
fb2 = display_bus.allocate_framebuffer(sz, lcd_bus.MEMORY_SPIRAM)

[kdschlosser]

Thanks for catching this. I did a rework on the initilization of the bus drivers and I removed the special handling for the RGB bus because it is no longer needed so I changed from using a void * buffer to using memoryviews that are stored in the structure for a bus driver. forgot to set the caps for the buffers.

If you are up for it I am ging to reduce the memory footprint of the bus drivers and I will need someone to test to make sure I didn't muck them up. If you are game for it that is going to be coming up as soon as I fix the issue with the USB-CDC stuff.

[grafail]

To be honest I have still not been able to get my display set up using micropython, but would be up for testing this.

[kdschlosser]

well give me the low down on what is going on with it...

[grafail]

well give me the low down on what is going on with it...
Added some more context here
#230