Add dependencies for the Renode Metrics Visualizer

These are prerequisites for a python tool packaged with
Renode for visualizing result of Renode's "Metrics Analyzer."

These tools will help us for one, keep a tally of how many times
each the vector instructions are called during program execution.

More information for these tools on the following link:
https://renode.readthedocs.io/en/latest/basic/metrics.html

Change-Id: Icb76bdfc5187a8f5113c6cf43d29a2e1898b060b

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index 6335b46..2b228b7 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -85,10 +85,12 @@
     setuptools
     robotframework==3.1
     netifaces
+    pandas
     psutil
     pyyaml
     hjson
     mako
+    matplotlib
     requests
 )