Replace mcuboot flash_map by zephyr flash_map

The patch introduce usage of zephyr flas_map module instead
of mcuboot zephyr-only implementation. Unused flash_area_to_sectors
API of former flash_map was removed as well.
Size of sector-status-update-map entry is now defined thanks to the
minimum write size supported by the flash driver.

For avoid ambiguity former zephyr-only files flash_map.c
were renamed to flash_map_extended.c (its code now implements
only addition to this what zephyr flash_map implements).

flash_map.h header include is now warped by flash_map_backedn.h headre
because implementations and include pathes are diferent in Zephyr and Mynewt.

Usage of hal_flash_align() were replaced by usage flash_area_align().
This provide consistency between MyNewt and Zephyr implementation as
this API is available in both RTOSes.

flash_map.h was moved to the simulator c-support files as now missing in
the boot/zephyr subdirectories.

f. boot_scratch_fa_device_id was removed as unused.
f. boot_img_fa_device_id was and expanded the only use of it
(on loader.c).

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
diff --git a/boot/bootutil/src/image_validate.c b/boot/bootutil/src/image_validate.c
index 496ed27..f9dcde3 100644
--- a/boot/bootutil/src/image_validate.c
+++ b/boot/bootutil/src/image_validate.c
@@ -23,7 +23,9 @@
 #include <string.h>
 
 #include "hal/hal_flash.h"
-#include "flash_map/flash_map.h"
+
+#include <flash_map_backend/flash_map_backend.h>
+
 #include "bootutil/image.h"
 #include "bootutil/sha256.h"
 #include "bootutil/sign_key.h"