Revert "leds: trigger: Remove unused function led_trigger_rename_static()"

This reverts commit b4e147d3 which is
commit c82a1662 upstream.

It breaks the Android kernel abi and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: Iea8ece3b5c88a97395e25c2ba7a512872a81e93f
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>