[coreboot] [flashrom] [PATCH] write_sst_fwhub: optimized for safety and speed

[Adam Jurkowski]

Optimized write_sst_fwhub for safety and speed:
Now uses block erase instead of chip erase. Also introduced auto skip 
feature.

Signed-off-by: Adam Jurkowski <adam.jurkowski at kontron.pl>
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It's the modification we use since may '08.
Now we want to add it to the main trunk together with Poulsbo support 
patch which will follow.

Tested with SST49LF008A.