mb/asus/p8z77-m_pro/early_init.c: Clean up

bootblock_mainboard_early_init():
Drop code that puts Super I/O into config mode, select serial device,
then leave config mode right away having done nothing.
Drop a no-longer-used #define as well.

mainboard_get_spd():
CB:73690 and CB:73691 allows SPD addresses to be declared in
devicetree, which was done in CB:73692. This allows dropping
this hook at the board level.

mainboard_fill_pei_data():
The only fields that need populating are GbE and USB
configurations. All others are already filled by northbridge code or
devicetree entries, and it makes no sense to nuke all that and redo
the entire table. Leave only code to fill the essentials and
drop everything else.

pei_data.h is included by raminit.h. No need to include it again.

TEST=It builds.

Change-Id: I304fc1610740375b59121b6b8784122440795838
Signed-off-by: Keith Hui <buurin@gmail.com>
---
M src/mainboard/asus/p8x7x-series/variants/p8z77-m_pro/early_init.c
1 file changed, 66 insertions(+), 103 deletions(-)