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>
This supports three types GD32 FMC flash memory. GD32 FMC v1,
GD32 FMC v2 and GD32 FMC v3.
GD32 FMC v1 for small flash memory, flash size can be up to 512KB.
GD32 FMC v2 for large flash memory, flash size can be up to 3072KB.
GD32 FMC v3 not use page but sector as minimum block, flash size can
be up to 3072KB.
Signed-off-by: HaiLong Yang <hailong.yang@brainco.cn>
