mtd: spi-nor: micron-st: add TODO for fixing mt35xu02gcba

mtd: spi-nor: micron-st: add TODO for fixing mt35xu02gcba

The MT35XU02GCBA flash device does not support chip erase, according to
its datasheet. It supports die erase, which means the current driver
implementation will likely need to be converted to use die erase.

Furthermore, similar to the MT35XU01GBBA, the
SPI_NOR_IO_MODE_EN_VOLATILE flag probably needs to be enabled.

Currently no active contributor has access to this hardware so there is
no way of testing the fixes. Add a TODO item on the flash entry so
someone with the flash can test that the support is indeed broken and
send the fixes.

Link: https://datasheet.octopart.com/MT35XU02GCBA1G12-0AAT-Micron-datasheet-138896808.pdf
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
[pratyush@kernel.org: refactor the comment and commit message to make
the purpose of the comment clearer]
Signed-off-by: Pratyush Yadav <pratyush@kernel.org>