Adds the flash device support for the file system storage media.
The implementation is generic for any flash device that implements
the flash API support.
Origin: original
Jira: ZEP-447
Change-Id: Ib89a6a64216cce1461da0bec6fa9588b97e06b41
Signed-off-by: Kuo-Lang Tseng <kuo-lang.tseng@intel.com>