Install current VNDK libs to the versioned directories.

If PLATFORM_VNDK_VERSION has a version $VER other than "current",
install current VNDK libs to /system/lib[64]/vndk[-sp]-$VER.
Otherwise, they will be installed to /system/lib[64]/vndk[-sp].

Bug: 69883025
Test: device boot
Change-Id: Ifa8564f39687dab5b407bf2178b13022625a94f3