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

* feature.lto -> build.lto

* keymaps too

keyboards/quadrum/delta/info.json

@@ -4,6 +4,9 @@
     "maintainer": "Sleepdealr",
     "bootloader": "atmel-dfu",
     "diode_direction": "COL2ROW",
+    "build": {
+        "lto": true
+    },
     "features": {
         "bootmagic": true,
         "command": false,
@@ -11,7 +14,6 @@
         "extrakey": true,
         "mousekey": true,
         "nkro": true,
-        "lto": true,
         "encoder": true
     },
     "matrix_pins": {