mtd: nand: support new Toshiba SLC

Toshiba does not use ONFI for their NAND flash. So we have to continue
to add new IDs used by Toshiba devices as well as heuristic detection
for scanning the 2nd page for a BBM. This is a relatively harmless
start at supporting many of them.

These chips mostly follow the same ID fields of previous generations,
but there is a need for a tweak.

These chips introduce a strange 576 byte OOB (that's 36 bytes per
512 bytes of page). In the preliminary data, Toshiba has not
defined exactly how their ID strings should decode. In the future,
a new tweak must be added.

Data is taken from, among others, Toshiba TC58TxG4S2FBAxx

Signed-off-by: Brian Norris <norris@broadcom.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

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