head-management: add mode-setter-v1 extension

wire/jay_head_ext_mode_setter_v1.txt

@@ -0,0 +1,17 @@
+request destroy (destructor) {
+
+}
+
+request set_mode {
+    idx: u32,
+}
+
+event reset {
+
+}
+
+event mode {
+    width: i32,
+    height: i32,
+    refresh_mhz: u32,
+}

wire/jay_head_manager_ext_mode_setter_v1.txt

@@ -0,0 +1,7 @@
+request destroy (destructor) {
+
+}
+
+event head {
+    head: id(jay_head_ext_mode_setter_v1) (new),
+}