[M] Change in flashrom[master]: flashrom.c:Add function to get a flattened view of the chip erase blocks

[Edward O'Callaghan (Code Review)]

Attention is currently required from: Simon Buhrow, Nico Huber, Thomas Heijligen, Paul Menzel, Aarya.

Edward O'Callaghan has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/65879 )

Change subject: flashrom.c:Add function to get a flattened view of the chip erase blocks
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Patch Set 55:

(1 comment)

File erasure_layout.c:

https://review.coreboot.org/c/flashrom/+/65879/comment/a77259ce_7a9f939e 
PS55, Line 58: 		chipoff_t addr = 0;
             : 
             : 		for (int i = 0; addr < chip->total_size * 1024; i++) {
             : 			const struct eraseblock *block = &chip->block_erasers[eraser_idx].eraseblocks[i];
             : 			block_count += block->count;
             : 			addr += block->size * block->count;
             : 		}
```
static size_t calculate_block_count(const struct flashchip *chip, size_t eraser_idx)
{
    size_t block_count = 0;

chipoff_t addr = 0;
    for (size_t i = 0; addr < chip->total_size * 1024; i++) {
    	const struct eraseblock *block = &chip->block_erasers[eraser_idx].eraseblocks[i];
    	block_count += block->count;
    	addr += block->size * block->count;
    }

return block_count;
}
```