boot: mynewt: Add build version comparison

For downgrade prevention it's possible to use build number
for grater control.
So far only Zephyr has this option in Kconfig now
option is also available in mynewt.

Signed-off-by: Jerzy Kasenberg <jerzy.kasenberg@codecoup.pl>

boot/mynewt/mcuboot_config/include/mcuboot_config/mcuboot_config.h

@@ -26,6 +26,9 @@
 #else
 #define MCUBOOT_IMAGE_NUMBER 1
 #endif
+#if MYNEWT_VAL(BOOTUTIL_VERSION_CMP_USE_BUILD_NUMBER)
+#define MCUBOOT_VERSION_CMP_USE_BUILD_NUMBER
+#endif
 #if MYNEWT_VAL(BOOT_SERIAL)
 #define MCUBOOT_SERIAL 1
 #endif

boot/mynewt/mcuboot_config/syscfg.yml

@@ -94,6 +94,14 @@ syscfg.defs:
  - version
  - security_counter
  value: none
+ BOOTUTIL_VERSION_CMP_USE_BUILD_NUMBER:
+ description: >
+ Use build number while comparing image version.
+ By default, the image version comparison relies only on version major,
+ minor and revision. Enable this option to take into account the build
+ number as well.
+ This only affect builds with BOOTUTIL_DOWNGRADE_PREVENTION set to version.
+ value: 0
  BOOTUTIL_HW_ROLLBACK_PROT:
  description: >
  Prevent undesirable/malicious software downgrades. When this option is