Map evdev keycode KEY_ROTATE_LOCK_TOGGLE to XF86RotationLockToggle

Add XF86RotationLockToggle, to be used as mapping for evdev's
KEY_ROTATE_LOCK_TOGGLE.

I've a Point of View P1006W-232 Windows tablet which actually has a
rotate-lock toggle-button. The latest kernel correctly generates
KEY_ROTATE_LOCK_TOGGLE events for this. So now I'm hooking up support for
it through all the higher layers.

The patch for adding the RotationLockToggle keysym to xproto is here:
https://patchwork.freedesktop.org/patch/279365/

Signed-off-by: Hans de Goede <hdegoede@redhat.com>

keycodes/evdev

@@ -286,6 +286,7 @@ default xkb_keycodes "evdev" {
 
 	<I372> = 372;   // #define KEY_FAVORITES           364
 	<I382> = 382;   // #define KEY_KEYBOARD            374
+	<I569> = 569;   // #define KEY_ROTATE_LOCK_TOGGLE  561
 
 	// Fake keycodes for virtual keys
 	<LVL3> =   92;

symbols/inet

@@ -220,6 +220,7 @@ xkb_symbols "evdev" {
 
     key <I372>  {       [ XF86Favorites          ]       };
     key <I382>  {       [ XF86Keyboard           ]       };
+    key <I569>  {       [ XF86RotationLockToggle ]       };
 
     key <FK13>   {      [ XF86Tools         ]       };
     key <FK14>   {      [ XF86Launch5       ]       };