Add libelf-dev apt package for verilator

The matcha verilator testbench uses libelf. If the developer package
is missing then the testbench will fail to build.

Fix: 290998114

Change-Id: Ib8effe05338eb1dbbb8afb0cb4c42766ab31bbdf

install-prereqs.sh

diff --git a/install-prereqs.sh b/install-prereqs.sh
index 7570c3d..5dae9f7 100755
--- a/install-prereqs.sh
+++ b/install-prereqs.sh
@@ -50,6 +50,7 @@
     g++
     gcc-11
     g++-11
+    libelf-dev
     libftdi1
     libftdi1-dev
     libfl2