arm/oeqa/fvp: wrap bootlog output correctly

Join the list of boot log lines with newlines, so it displays properly.

Signed-off-by: Ross Burton <ross.burton@arm.com>

meta-arm/lib/oeqa/controllers/fvp.py

@@ -64,7 +64,7 @@ class OEFVPTarget(oeqa.core.target.ssh.OESSHTarget):
                 return
         except asyncio.TimeoutError:
             self.logger.info("Timed out waiting for login prompt.")
-        self.logger.info(b"".join(bootlog.splitlines()[-20:]).decode("utf-8", errors="replace"))
+        self.logger.info(b"\n".join(bootlog.splitlines()[-20:]).decode("utf-8", errors="replace"))
         raise RuntimeError("Failed to start FVP.")
 
     def start(self, **kwargs):