[Keyboard] Add "Uno" rev2 (#14071)

* [Keyboard] Add "Uno" rev2

Adds support for the second revision of Uno, courtesy of @Snipeye.

* Update keyboards/uno/rev2/rules.mk

* Update keyboards/uno/rev1/rules.mk

* Update keyboards/uno/uno.h

* Update keyboards/uno/rev2/rules.mk

* Update keyboards/uno/rev1/rules.mk

* Update keyboards/uno/keymaps/demo/keymap.c

* Update keyboards/uno/keymaps/demo/keymap.c

* Update keyboards/uno/keymaps/demo/keymap.c

* Update keyboards/uno/rev2/rules.mk

* Update keyboards/uno/rev1/rules.mk

* Align rules.mk comments

* Update keyboards/uno/info.json

* Update keyboards/uno/rev1/config.h

* Update keyboards/uno/rev2/config.h

* Update keyboards/uno/rev2/config.h

* Update keyboards/uno/rev2/config.h

* Update keyboards/uno/rev1/config.h

keyboards/uno/uno.h

@@ -13,12 +13,13 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+
 #pragma once
 
 #include "quantum.h"
 
-#define LAYOUT( \
-  K00  \
-) { \
-  { K00 } \
-}
+#if defined(KEYBOARD_uno_rev1)
+#    include "rev1.h"
+#elif defined(KEYBOARD_uno_rev2)
+#    include "rev2.h"
+#endif