Add TTY switching support for Chromebook keyboards

Enable Ctrl+Alt+F1-F8 TTY switching for both keyboard modes:
- Inverted mode: F-keys map directly to TTY switches
- Non-inverted mode: Chrome keys (back/forward/refresh/etc) map to TTY switches

This allows proper virtual console access on Chromebooks running Linux,
which is essential for troubleshooting, recovery, and server management.

Author: stefanpricopie

cros-keyboard-map.py

@@ -157,6 +157,24 @@ def get_keyd_config(physmap, inverted):
 
 [control+alt]
 backspace = C-A-delete
+# TTY switching for inverted mode (F-keys by default)
+f1 = C-A-f1
+f2 = C-A-f2
+f3 = C-A-f3
+f4 = C-A-f4
+f5 = C-A-f5
+f6 = C-A-f6
+f7 = C-A-f7
+f8 = C-A-f8
+# TTY switching for non-inverted mode (Chrome keys by default)
+back = C-A-f1
+forward = C-A-f2
+refresh = C-A-f3
+zoom = C-A-f4
+scale = C-A-f5
+brightnessdown = C-A-f6
+brightnessup = C-A-f7
+mute = C-A-f8
 """
     return config