[flashrom] [RFC] Firmware Hub chipdriver Unification

[Sean Nelson]

This Patch provides a unified chip driver for Firmware Hub (FWH).
It is heavily based on 80802ab.c and combines all related code from the 
following:
sharplhf00l04.c
sst28sf040.c
sst49lfxxxc.c
stm50flw0x0x.c

Signed-off-by: Sean Nelson

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This is the first of 3 patches for FWH unification.
Patch 1: fwhub driver
Patch 2: connect/convert fwh drivers
Patch 3: decouple old fwh drivers

This is a Request of comments, the signoff is in case no one has any 
problems ;-)