Boot: introduce CMSIS flash interface and driver

Replace legacy flash interface and driver with
CMSIS compliant version:
 -- remove legacy flash interface
 -- add CMSIS compliant version

Change-Id: I8798d191d8f806500621f76c3c3f62d75aceb7cb
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
20 files changed