Add symlinks for old go7007 firmware filenames

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/s2250.fw b/s2250.fw
new file mode 120000 (symlink)
index 0000000..7db3807
--- /dev/null
+++ b/s2250.fw
@@ -0,0 +1 @@
+go7007/s2250-2.fw
\ No newline at end of file

diff --git a/s2250_loader.fw b/s2250_loader.fw
new file mode 120000 (symlink)
index 0000000..b57ac10
--- /dev/null
+++ b/s2250_loader.fw
@@ -0,0 +1 @@
+go7007/s2250-1.fw
\ No newline at end of file