samples: led_ws2812: ESP32 support

Add overlays for esp32s2, esp32s3, esp32c3 based boards, which
has RGB led assembled. Those boards are capable of driving the
RGB led using SPI. The default MOSI idle level is different
to how DI driver expect it to be.

Signed-off-by: Marek Matej <marek.matej@espressif.com>