Merge "Update prebuilt signapk to #7521996 aosp-arm64" am: 15a0eaea74 am: 9df565e22b

Original change: https://android-review.googlesource.com/c/platform/prebuilts/sdk/+/1755869

Change-Id: Ib7342b1892919f32bae0c11cbfa681671e4d75a5