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/zephyr/main.c b/boot/zephyr/main.c
index 6dda3bd..94963b1 100644
--- a/boot/zephyr/main.c
+++ b/boot/zephyr/main.c
@@ -27,7 +27,7 @@
 #include "bootutil/bootutil_log.h"
 #include "bootutil/image.h"
 #include "bootutil/bootutil.h"
-#include "flash_map/flash_map.h"
+#include "flash_map_backend/flash_map_backend.h"
 
 #ifdef CONFIG_MCUBOOT_SERIAL
 #include <boot_serial/boot_serial.h>
@@ -37,8 +37,6 @@
 
 void os_heap_init(void);
 
-extern void zephyr_flash_area_warn_on_open(void);
-
 #if defined(CONFIG_ARM)
 struct arm_vector_table {
     uint32_t msp;
@@ -138,7 +136,7 @@
 
     BOOT_LOG_INF("Bootloader chainload address offset: 0x%x",
                  rsp.br_image_off);
-    zephyr_flash_area_warn_on_open();
+
     BOOT_LOG_INF("Jumping to the first image slot");
     do_boot(&rsp);