bootutil: Add manifest-based loader for Direct XIP

Add a loader variant that is capable of booting images, based on a
simple manifest.

Signed-off-by: Tomasz Chyrowicz <tomasz.chyrowicz@nordicsemi.no>

Author: tomchy

boot/bootutil/CMakeLists.txt

@@ -33,6 +33,7 @@ target_sources(bootutil
         src/image_rsa.c
         src/image_validate.c
         src/loader.c
+        src/loader_manifest_xip.c
         src/swap_misc.c
         src/swap_move.c
         src/swap_scratch.c

boot/bootutil/src/loader.c

@@ -51,6 +51,8 @@
 #include "bootutil/mcuboot_status.h"
 #include "bootutil_loader.h"
 
+#ifndef MCUBOOT_MANIFEST_UPDATES
+
 #ifdef MCUBOOT_ENC_IMAGES
 #include "bootutil/enc_key.h"
 #endif
@@ -2498,3 +2500,5 @@ uint32_t boot_get_state_secondary_offset(struct boot_loader_state *state,
     return 0;
 }
 #endif
+
+#endif /* !MCUBOOT_MANIFEST_UPDATES */