mediatek: add Motorcomm PHY driver to Cudy WR3000H

mediatek: add Motorcomm PHY driver to Cudy WR3000H

Recent Cudy WR3000H v1 units have a Motorcomm YT8821 2.5G PHY for
the WAN interface instead of the RTL8221B PHY used in earlier units,
so add kmod-phy-motorcomm to be able to use it.

Signed-off-by: Andrew MacIntyre <andymac@pcug.org.au>
[linuxtardis@gmail.com: slightly reworded the commit description]
Signed-off-by: Jakub Vaněk <linuxtardis@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/21399
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>