flashrom: upgrade to v0.9.9 from Chromium OS R80

Update flashrom and libfdt to the versions from Chromium OS R80, that
is to say flashrom v0.9.9 and libfdt v1.4.7.
Signed-off-by: Guillaume Tucker <guillaume.tucker@collabora.com>

lib/.gitattributes

+libfdt-1.4.7.so filter=lfs diff=lfs merge=lfs -text

lib/libfdt.so.1

-libfdt-1.4.4.so
\ No newline at end of file
+libfdt-1.4.7.so
\ No newline at end of file