ms: add demod test tool and data

It just uses the viterbi equalizer and the sigproclib to generate and
demodulate bursts and prints the bits, only useful for
development.

Change-Id: I852e34d9667d1f12f235f8b3da1fcc0d738b2db9
diff --git a/.gitignore b/.gitignore
index 0b33e0f..581b08f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -83,6 +83,7 @@
 !contrib/osmo-trx.spec.in
 
 utils/osmo-prbs-tool
+utils/va-test/osmo-burst-gen
 /.qtc_clangd/*
 /.cache/*
 /.vscode/*