Update with raviole build commands and remove the section of legacy
build scripts.

Bug: 319536450
Signed-off-by: Jacky Liu <qsliu@google.com>
(cherry picked from https://partner-android-review.googlesource.com/q/commit:6ad9b11830a7f28b8594a8e72345f2609c01de80)
Merged-In: I47568ba3c700005b44a24d69bbd06d948337750b
Change-Id: I47568ba3c700005b44a24d69bbd06d948337750b