Add Support for XMC1400 2GO (KIT_XMC14_2GO)

[Brand-IFX]

Summary

• This PR adds support for the Infineon XMC1400 2GO evaluation board (KIT_XMC14_2GO) to the Adafruit_NeoPixel library.
• The change consists of recognizing the XMC1400_XMC2GO board in Adafruit_NeoPixel.cpp (around line 2505) so that NeoPixel functionality works on this platform.

Motivation and Context

• The XMC1400 2GO was not previously supported by Adafruit_NeoPixel, preventing users of this board from using the library.
• Infineon Technologies AG (CSS DSI TM AE) implemented and verified the necessary changes to enable compatibility.

Changes

• Added a preprocessor check for XMC1400_XMC2GO in Adafruit_NeoPixel.cpp to route to the correct implementation for this board.
• No functional changes for other platforms; this is an additive board support update.

Testing

• Verified with multiple notebooks and several XMC1400 2Go boards.
• Standard NeoPixel examples (e.g., strandtest) run successfully on the XMC1400 2GO.

Links

• Board: https://www.infineon.com/evaluation-board/KIT_XMC14-2GO
• Library: https://github.com/adafruit/Adafruit_NeoPixel

Thank you for reviewing this contribution from Infineon Technologies AG (CSS DSI TM AE).