[nrf fromtree] bootutil: Add mode for XIP with revert

Adds a new define if bootloader in built in direct-XIP with revert
mode

Signed-off-by: Jamie McCrae <[email protected]>
(cherry picked from commit 8d0b35a)
Signed-off-by: Dominik Ermel <[email protected]>

Author: nordicjm

boot/bootutil/include/bootutil/boot_status.h

@@ -121,6 +121,7 @@ enum mcuboot_mode {
     MCUBOOT_MODE_UPGRADE_ONLY,
     MCUBOOT_MODE_SWAP_USING_MOVE,
     MCUBOOT_MODE_DIRECT_XIP,
+    MCUBOOT_MODE_DIRECT_XIP_WITH_REVERT,
     MCUBOOT_MODE_RAM_LOAD
 };