device info in /proc/mtd

[John Burch]

> 
> Something like this in /proc/mtd might be nice:
> 
> dev:    size   erasesize  name       manufacturer chip chip_name
> mtd0: 00080000 00001000 "AMD76X rom" 009d         006e "PMC Pm49FL004"
> 

It'd also be nice to see the value of CFG_MTD_PHYSMAP_START, maybe as
'base'.