Add MacroPad RP2040 u2if Detection

[jfurcean]

This adds detection for the MacroPad RP2040 u2if. It needs a new USB PID before it can be merged. The PR execuc/u2if#7 should be merged before this one as well. @caternuson

[caternuson]

@ladyada Can we offer up a new PID for this? We came up with new ones for Feather, Itsy, etc. as I remember:

Adafruit_Python_PlatformDetect/adafruit_platformdetect/board.py

Lines 479 to 490 in 00db106

	# Feather RP2040
	if product == 0x00F1:
	return boards.FEATHER_U2IF
	# Itsy Bitsy RP2040
	if product == 0x00FD:
	return boards.ITSYBITSY_U2IF
	# QT Py RP2040
	if product == 0x00F7:
	return boards.QTPY_U2IF
	# QT2040 Trinkey
	if product == 0x0109:
	return boards.QT2040_TRINKEY_U2IF

[ladyada]

@caternuson yeah do you have access/know how to assign a new PID?

[caternuson]

@ladyada I do not.

[ladyada]

@dhalbert can illuminate it for ya!

[dhalbert]

@caternuson Use 0x239A/0x0107 for MacroPad u2if. We mistakenly assigned this to bootloader, but like other RP2040's it has its own due to the ROM bootloader.

[caternuson]

@jfurcean One quick change and I think we can merge. Tested this locally with a MacroPad loaded with new U2IF firwmare. All works as expected.