package/linux-firmware: add RTL8125B NIC firmware
Needed due to kernel commit:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=0439297be95111cf9ef5ece2091af16d140ce2ef
Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>