extcon: Add basic support for Maxim MAX14526 MUIC

extcon: Add basic support for Maxim MAX14526 MUIC

The MAX14526 is designed to simplify interface requirements on portable
devices by multiplexing common inputs (USB, UART, Microphone, Stereo Audio
and Composite Video) on a single micro/mini USB connector. The USB input
supports Hi-Speed USB and the audio/video inputs feature negative rail
signal operation allowing simple DC coupled accessories. These device allow
a single micro/mini USB port to support all the common interfaces on
Cellular phones and portable media players over the same external lines.

Link: https://lore.kernel.org/lkml/20250506073216.43059-3-clamor95@gmail.com/
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>