Boot: Use the same flash_map module as upstream MCUBoot

Add new sysflash.h and flash_map_extended.h files as they are needed to
build TF-M with the original MCUBoot. Some of the macro definitions and
function declarations from flash_map.h were moved into these
new headers.

Change-Id: I9b5ddeba9528c82c7ccfc59fbba5c661f0ad1084
Signed-off-by: David Vincze <david.vincze@arm.com>
10 files changed