rtl8214fc_media_is_fibre() will need to be run when bus lock is held.
Split the function into two versions.
Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
Link: https://github.com/openwrt/openwrt/pull/18935
Signed-off-by: Robert Marko <robimarko@gmail.com>