novatek-tcon-fw-update-tool: rename main.cpp to main.cc

This is in preparation for creating a Makefile based around common.mk,
which only supports .cc for C++ file extension.  I prefer renaming the
file over modifying forked common.mk.

BUG=b:112485400
TEST=With the right empty directories created, compile.sh continues to
succeed (tested outside of CrOS chroot).

Change-Id: I0ba8e5b0a298e59116412ba9d4b2c6924ec29e20
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/novatek-tcon-fw-update-tool/+/1956649
Tested-by: Matthew Blecker <matthewb@chromium.org>
Reviewed-by: Grant Grundler <grundler@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Matthew Blecker <matthewb@chromium.org>
2 files changed