mtd: spinand: Add support for packed read data ODTR commands

mtd: spinand: Add support for packed read data ODTR commands

Some devices stuff address bits in the double byte opcode (in place of
the repeated byte) in order to be able to increase the size of the
devices, without adding extra address bytes.

Create a flag to identify those devices. When the flag is set, use the
"packed" variant for the read data operation.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>