Ensure LTO is enabled as a info.json build config option (#22932)

* feature.lto -> build.lto

* keymaps too

keyboards/moondrop/dash75/info.json

@@ -3,14 +3,16 @@
     "keyboard_name": "Dash 75",
     "maintainer": "vinorodrigues",
     "bootloader": "atmel-dfu",
+    "build": {
+        "lto": true
+    },
     "features": {
         "bootmagic": true,
         "command": false,
         "console": false,
         "extrakey": true,
         "mousekey": true,
-        "nkro": false,
-        "lto": true
+        "nkro": false
     },
     "diode_direction": "COL2ROW",
     "matrix_pins": {

keyboards/moondrop/dash75/keymaps/via/keymap.json

@@ -7,8 +7,7 @@
     "author": "vinorodrigues",
     "config": {
         "features": {
-            "via": true,
-            "lto": true
+            "via": true
         }
     },
     "layers": [