rvi-sota-client_git: add RVI SOTA client

Build and deploy sota_client and a systemd
service. The application is written in the Rust
programming language and depends on Cargo
therefore the recipe requires on meta-rust. It is
using crate dbus-rs version 0.1.2 with fixed
casts of c_char raw pointers for ARM.

Bug-AGL: SPEC-176

Change-Id: Ic8f24ae3dd2e62297e303be23a40759b0b919b86
Signed-off-by: Leon Anavi <leon.anavi@konsulko.com>