Attest: Refactor shared data TLV entry header

It was done to make easier the lookup of boot status
relatead entries, which belongs to the same SW module.

Change-Id: I753dc03a2373d1975245502288e10c507402b6d5
Signed-off-by: Tamas Ban <tamas.ban@arm.com>
diff --git a/bl2/ext/mcuboot/bootutil/src/loader.c b/bl2/ext/mcuboot/bootutil/src/loader.c
index 888118e..f038785 100644
--- a/bl2/ext/mcuboot/bootutil/src/loader.c
+++ b/bl2/ext/mcuboot/bootutil/src/loader.c
@@ -20,7 +20,7 @@
 /*
  * Original code taken from mcuboot project at:
  * https://github.com/runtimeco/mcuboot
- * Modifications are Copyright (c) 2018 Arm Limited.
+ * Modifications are Copyright (c) 2018-2019 Arm Limited.
  */
 
 /**
@@ -298,7 +298,7 @@
         return -1;
     } else {
         if (0 != boot_add_data_to_shared_area(TLV_MAJOR_IAS,
-                                              TLV_MINOR_IAS_S_NS_SHA256,
+                                              TLV_MINOR_IAS_S_NS_MEASURE_VALUE,
                                               sizeof(hash),
                                               hash)) {
             BOOT_LOG_ERR("Failed to add data to shared area");