mtd: spinand: winbond: Add support for continuous reads on W25NxxJW

mtd: spinand: winbond: Add support for continuous reads on W25NxxJW

As for the W35NxxJW family, add support for W25N{01,02}JW continuous
read support. Similar operations require to be done, such as setting a
specific bit in a configuration register, and providing a set of read
variants without the address cycles.

As read from cache variants are badly supported by SPI memory
controllers, we create a new set of read from cache templates with a
fake address cycle and just enough dummy cycles. There are two
unsupported configurations (which would require 4.5 dummy bytes), so we
just do not provide them.

The same extra value in the ECC is possible as with the W35NxxJW family,
so we reference the same helper to retrieve the ECC status.

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