Merge "Introduce sh.vendor_ramdisk." am: 3139f96069 am: c7cff8ed5d am: 7b8ded2414

Original change: https://android-review.googlesource.com/c/platform/external/mksh/+/1469768

Change-Id: Ib433bf2ab39b06d52c72a90b32bd13ea8db67322