Revert "Add mkbootfs to build-tools" am: 8c4e38f41b am: 9c75231ecd

Original change: https://android-review.googlesource.com/c/platform/prebuilts/build-tools/+/1696949

Change-Id: I8c46af126d37ec83894c0c23a014d113ce540359
diff --git a/build-prebuilts.sh b/build-prebuilts.sh
index 53463c2..9b9d261 100755
--- a/build-prebuilts.sh
+++ b/build-prebuilts.sh
@@ -71,7 +71,6 @@
         hidl-lint
         m4
         make
-        mkbootfs
         ninja
         one-true-awk
         openssl