contexthub: Pass target API version in new fields

Update default implementation to use the new fields defined explicitly
for passing in target CHRE API version information, rather than adding
this data into the reserved area.

Bug: 64852297
Test: run CHQTS on Nanohub, rebuild test app targeting 1.2 and confirm
      it's interpreted correctly
Change-Id: Id11f9b510a2d239d285436e119b7b8dbece4c5df
diff --git a/contexthub/1.0/default/Contexthub.cpp b/contexthub/1.0/default/Contexthub.cpp
index bf45900..3626a09 100644
--- a/contexthub/1.0/default/Contexthub.cpp
+++ b/contexthub/1.0/default/Contexthub.cpp
@@ -440,18 +440,15 @@
     // Data from the nanoapp header is passed through HIDL as explicit fields,
     // but the legacy HAL expects it prepended to the binary, therefore we must
     // reconstruct it here prior to passing to the legacy HAL.
-    uint32_t targetChreApiVersion =
-        (appBinary.targetChreApiMajorVersion << 24) |
-        (appBinary.targetChreApiMinorVersion << 16);
     const struct nano_app_binary_t header = {
         .header_version = htole32(1),
-        .magic          = htole32(NANOAPP_MAGIC),
-        .app_id.id      = htole64(appBinary.appId),
-        .app_version    = htole32(appBinary.appVersion),
-        .flags          = htole32(appBinary.flags),
-        .hw_hub_type    = htole64(0),
-        .reserved[0]    = htole32(targetChreApiVersion),
-        .reserved[1]    = 0,
+        .magic = htole32(NANOAPP_MAGIC),
+        .app_id.id = htole64(appBinary.appId),
+        .app_version = htole32(appBinary.appVersion),
+        .flags = htole32(appBinary.flags),
+        .hw_hub_type = htole64(0),
+        .target_chre_api_major_version = appBinary.targetChreApiMajorVersion,
+        .target_chre_api_minor_version = appBinary.targetChreApiMinorVersion,
     };
     const uint8_t *headerBytes = reinterpret_cast<const uint8_t *>(&header);