libpropertyinfoparser: make vendor_ramdisk_available. am: f3b2b96925 am: 4570aa6caa am: 043cbc8c0b

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1470051

Change-Id: Ie3cc5c532a5190657e17547aaf35fc9e624724f9