`hal::soft::common_spi_flash` driver

[kammce]

Many SPI flash memory devices use the JEDEC standard for SPI communication. This driver should support JEDEC compliant SPI flash devices.

[kammce]

Take a look at for more information:

• https://en.wikipedia.org/wiki/Common_Flash_Memory_Interface
• https://www.infineon.com/dgdl/Infineon-AN98488_Quick_Guide_to_Common_Flash_Interface-ApplicationNotes-v05_00-EN.pdf?fileId=8ac78c8c7cdc391c017d07413e71645f
• http://netwinder.osuosl.org/pub/netwinder/docs/nw/flash/29220403.pdf