fs: Add file system API to flush cache of an open file

This API flushes the cached data of an open file to the
storage media. This can be called after writes to avoid data
loss if power is removed unexpectedly.

Jira: ZEP-767
Change-Id: I0f99f2f34126aa8e6a43f69c7a1b6d903937de11
Signed-off-by: Ramesh Thomas <ramesh.thomas@intel.com>
2 files changed