[PATCH] mtd: use the full-id string as the keyword to search the id table

[Huang Shijie]

hi Brian:
> And I didn't check too closely, but I think HY27UT088G2M (and maybe
> HY27UW08CGFM?) should be supported by the ID decoding and don't need
> new table entries.
I recheck the datasheets of HY27UT088G2M/HY27U208CGFM, the chipsize can 
be culculated by parsing the ID data.
the new table entries are not needed.

BR
Huang Shijie