leds: trigger: Remove unused function led_trigger_rename_static()

This function was added with a8df7b1a ("leds: add led_trigger_rename
function") 11 yrs ago, but it has no users. So remove it.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/d90f30be-f661-4db7-b0b5-d09d07a78a68@gmail.com


Signed-off-by: Lee Jones <lee@kernel.org>