Add user LED to pins.c

[KanyonKris]

Seeed Xiao ESP32-C6 has an LED on GPIO15 for general use in user programs. Commonly these LEDs are defined for the board. So would be good to add this LED pin definition. Schematic showing LED connected to GPIO15 (sheet4, zone D2) - https://files.seeedstudio.com/wiki/SeeedStudio-XIAO-ESP32C6/XIAO-ESP32-C6_v1.0_SCH_PDF_24028.pdf

[Neradoc]

Thanks, I note that the LED is active low. In cases like that we have used LED_INVERTED. Most of the times having both, with the presence of the "inverted" alias making it discoverable that the LED is inverted. (And sometimes only LED_INVERTED like on the Xiao M0, but it has multiple LEDs and labels them with colors).

circuitpython/ports/espressif/boards/ai-thinker-esp32-cam/pins.c

Lines 32 to 33 in ceda2f0

	{ MP_ROM_QSTR(MP_QSTR_LED), MP_ROM_PTR(&pin_GPIO33) },
	{ MP_ROM_QSTR(MP_QSTR_LED_INVERTED), MP_ROM_PTR(&pin_GPIO33) },

[KanyonKris]

Thanks, I note that the LED is active low. In cases like that we have used LED_INVERTED. Most of the times having both, with the presence of the "inverted" alias making it discoverable that the LED is inverted. (And sometimes only LED_INVERTED like on the Xiao M0, but it has multiple LEDs and labels them with colors).

Good idea. I added LED_INVERTED

[dhalbert]

Thanks for this.

I am not so sure having both LED and LED_INVERTED is the clearest solution, but it's been the trend up to now, as @Neradoc noted, so we can leave it.