[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
......................................................................

Patch Set 55:

(1 comment)

File erasure_layout.c:

https://review.coreboot.org/c/flashrom/+/65879/comment/66334cbb_43abe22f 
PS55, Line 82: 				layout[layout_idx].layout_list[block_num].start_addr = start_addr;
             : 				layout[layout_idx].layout_list[block_num].end_addr = end_addr;
             : 				layout[layout_idx].layout_list[block_num].selected = false;
             : 				layout[layout_idx].layout_list[block_num].block_num = block_num;
             : 				if (layout_idx > 0) {
             : 					layout[layout_idx].layout_list[block_num].first_sub_block_index = sub_block_index;
             : 					while (layout[layout_idx-1].layout_list[sub_block_index].start_addr >= start_addr &&
             : 						layout[layout_idx-1].layout_list[sub_block_index].end_addr <= end_addr &&
             : 						sub_block_index < layout[layout_idx-1].block_count) {
             : 						sub_block_index++;
             : 					}
             : 					layout[layout_idx].layout_list[block_num].last_sub_block_index = sub_block_index - 1;
             : 				}
```
static void init_eraseblock(struct erase_layout *layout, size_t idx, size_t block_num, [..])
{
    struct eraseblock_data *edata = &layout[idx].layout_list[block_num];

edata->start_addr = start_addr;
    edata->end_addr = end_addr;
    edata->selected = false;
    edata->block_num = block_num;

if (!idx)
    	return;

edata->first_sub_block_index = sub_block_index;

do {
    	struct eraseblock_data *subedata = &layout[idx - 1].layout_list[sub_block_index];
    	const sub_block_count = layout[idx - 1].block_count;
    	bool sub_block_inc = subedata->start_addr >= start_addr &&
    			     subedata->end_addr <= end_addr &&
    			     sub_block_index < sub_block_count;

sub_block_index++;
    } while (sub_block_inc);

edata->last_sub_block_index = sub_block_index - 1;
}
```

something like this.