Commit c7b28e25 ("mtd: nand: refactor BB 
marker detection") caused a regression in detection of factory-set bad 
block markers, especially for certain small-page NAND. This fix removes 
some unneeded constraints on using NAND_SMALL_BADBLOCK_POS, making the 
detection code more correct.

This regression can be seen, for example, in Hynix HY27US081G1M and
similar.
Signed-off-by: NBrian Norris <norris@broadcom.com>
Tested-by: NMichael Guntsche <mike@it-loops.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>