mtd: nand: gpmi: Use subpage reads only on suitable NAND chips
On some NAND chips the driver uses a ECC size that is not dividable by
the number of chunks per page which means a single chunk cannot be read.
Disable the subpage feature for these NANDs. This is quite unfortunate
since the subpage feature really speeds up scanning NAND chips.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>