[p8x7x port] Realtek loses its mind & Marvell not going with times.

(Catchy subject eh? There's some truth to both.)

My coreboot port to Asus P8Z77-V LE PLUS is almost ready, but I still
have two outstanding problems.

The board is losing its MAC address, partly because it doesn't have an
EEPROM for vital product data. I enabled the rtl8168 driver in
coreboot so I can configure the LEDs and MAC address. Lights work
great, but the MAC address always revert to 00:00:00:00:00:05 by the
time Linux kernel sees it. I would then have to reassign its proper
MAC address using "ip link change eno0 address <mac>".

I added a debug read back in the rtl81xx driver and the device appears
to be taking the MAC I programmed.

Board also has a Marvell 88SE9120 for two extra SATA ports. It came up
in legacy mode and pata_marvell driver isn't able to operate it. I
find no documentation on how to switch to AHCI mode like ASM1061.
Needless to say those two ports are currently useless.

Ideas? I'm hoping to get this and a few supporting patches in for next release.

https://review.coreboot.org/c/coreboot/+/86172

Thanks
Keith
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