Use prebuilt otatools for mixed build

Enable mixed_build script to use prebuilt otatools for packaging
image files. If we have otatools.zip file, use '-t' option to use
the prebuilt tools instead of building them in mixed branches.

Bug: 112732863
Test: run mixed_build with otatools using the command below:
 $ development/vndk/tools/build_mixed -v 9 \
   -m development/vndk/tools/modify_system_img.sh \
   -p out/prebuilt_cached/artifacts/system/vbmeta.img \
   -t out/prebuilt_cached/artifacts/system/otatools.zip \
   out/prebuilt_cached/artifacts/system \
   out/prebuilt_cached/artifacts/taimen \
   dist \
   out/prebuilt_cached/artifacts/system/checkvintf

Change-Id: I7891a2bad2f4e471baffb987149a39bbbd57f26e

vndk/tools/build_mixed

@@ -41,7 +41,7 @@ cleanup_and_exit () {
 
 trap cleanup_and_exit EXIT
 
-while getopts :v:m:p: opt; do
+while getopts :v:m:p:t: opt; do
     case "$opt" in
         v)
             readonly VENDOR_VERSION="$OPTARG"
@@ -52,6 +52,9 @@ while getopts :v:m:p: opt; do
         p)
             readonly OVERRIDE_VBMETA_IMAGE_PATH="$OPTARG"
             ;;
+        t)
+            readonly OTATOOLS_ZIP="$OPTARG"
+            ;;
         \?)
             exit_badparam "Invalid options: -"$OPTARG""
             ;;
@@ -119,6 +122,7 @@ readonly DEVICE_ARTIFACTS_DIR="$TEMP_DIR"/device_archive_artifacts
 readonly DEVICE_IMAGES_DIR="$DEVICE_ARTIFACTS_DIR"/IMAGES
 readonly SYSTEM_ARTIFACTS_DIR="$TEMP_DIR"/system_artifacts
 readonly SYSTEM_IMAGES_DIR="$SYSTEM_ARTIFACTS_DIR"/IMAGES
+readonly OTATOOLS_DIR="$TEMP_DIR"/otatools
 
 readonly SPL_PROPERTY_NAME="ro.build.version.security_patch"
 readonly SYSTEM_BUILD_PROP="SYSTEM/build.prop"
@@ -139,6 +143,15 @@ unzip "$DEVICE_TARGET_FILES_ARCHIVE" \
   META/vendor_matrix.xml META/vendor_manifest.xml "$SYSTEM_BUILD_PROP" \
   -d "$DEVICE_ARTIFACTS_DIR"
 
+if [[ -f "$OTATOOLS_ZIP" ]]; then
+    # Uncompress otatools
+    mkdir -p "$OTATOOLS_DIR"
+    unzip "$OTATOOLS_ZIP" -d "$OTATOOLS_DIR"
+    # Set paths for using prebuilt host binaries.
+    export PATH="$OTATOOLS_DIR"/bin:"$PATH"
+    export LD_LIBRARY_PATH="$OTATOOLS_DIR"/lib64:"$LD_LIBRARY_PATH"
+fi
+
 ###
 # Check compatibility between the system and device.
 if [[ -f "$CHECK_TOOL" ]]; then