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/Kconfig b/boot/zephyr/Kconfig
index 14eba57..bc3c234 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -129,6 +129,8 @@
 	select MCUBOOT_DEVICE_CPU_CORTEX_M0 if CPU_CORTEX_M0
         # Enable flash page layout if available
 	select FLASH_PAGE_LAYOUT if FLASH_HAS_PAGE_LAYOUT
+	# Enable flash_map module as flash I/O back-end
+	select FLASH_MAP
 
 config MCUBOOT_DEVICE_CPU_CORTEX_M0
 	# Hidden selector for Cortex-M0 settings