Merge "repack_bootimg: changes the default path of --ramdisk_add" am: c1d56bbd1b am: bca59d92ab am: 9e3a1e8d4c am: b8021f3120

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/1688291

Change-Id: Ie5b0081f19d8bd0f4c4eb12dd9d4d86dd33527ee