Add explicit_erase capability and set proper value to it,
depending on type of a device.
Select FLASH_HAS_EXPLICIT_ERASE by devices that have program-erase
characteristics and FLASH_HAS_NO_EXPLICIT_ERASE, where needed.
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
Update flash drivers to use DT_HAS_<compat>_ENABLED Kconfig symbol
to expose the driver and enable it by default based on devicetree.
We remove 'depend on' Kconfig for symbols that would be implied by
the devicetree node existing.
Signed-off-by: Kumar Gala <galak@kernel.org>
