SST: Implement SST flash on top of CMSIS flash drv

This patch implements SST flash interface on top
of CMSIS flash driver.
It also adds a missing include in sst_utils.h.

Change-Id: I70610584a124d72c2ec6bd911618e0c60e3c7463
Signed-off-by: Marc Moreno <marc.morenoberengue@arm.com>
13 files changed