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

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

Change-Id: I7a16e5e8dd3ab675640aa077107615a3b0bfa6df