wifi: rtw89: add LED support to reflect the wireless association status

Add a new RTW89_LEDS Kconfig option, along with LED structures to describe
flexible GPIO mappings for chip common LED definition. Core LED lifecycle
and registration logic default to the mac80211 association trigger, and
chips are wired up as the first user with a single-GPIO monochrome LED.

Usage:
- Auto-triggered (default):
  ON when connected, OFF when disconnected
- Manual override:
    echo <1|0> > /sys/class/leds/rtw89-phyX/brightness

Signed-off-by: Johnson Tsai <wenjie.tsai@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Link: https://patch.msgid.link/20260717061910.54466-2-pkshih@realtek.com

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