nb/intel/sandybridge: Refactor pei_data building code

Incorporate fixed constants and simple data members into struct
pei_data as it gets initialized and make more use of existing helpers.
Compiler zeroes structs set up this way so the memset() is no longer
needed.

Drop northbridge_fill_pei_data() as it gets replaced entirely.

Gut southbridge_fill_pei_data() in preparation for having southbridge
code fill in USB-related members.

This is to make the code easier to maintain, and realizes small savings
in compiled code size too.

Change-Id: I3140cb99b0106669aa27788641c2895ced048e95
Signed-off-by: Keith Hui <buurin@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82480
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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