Adding extra supported Boardwalk layout (qmk#9341)

* Added ortho layout with 2x2u spacebars

Author: Rolf Don

keyboards/boardwalk/boardwalk.h

@@ -17,6 +17,21 @@
   { k40, k41, k42, k43, k44, k45, k46, k47, k48, k49, k410, k411, k412, k413 } \
 }
 
+#define LAYOUT_ortho_2x2u( \
+  k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, k010, k011, k012, k013, \
+  k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, k110, k111, k112, k113, \
+  k20, k21, k22, k23, k24, k25, k26, k27, k28, k29, k210, k211, k212, k213, \
+  k30, k31, k32, k33, k34, k35, k36, k37, k38, k39, k310, k311, k312, k313, \
+  k40, k41, k42, k43, k44,   k45,     k47,     k49, k410, k411, k412, k413  \
+) \
+{ \
+  { k00,   k01, k02, k03, k04, k05, k06,   k07, k08,   k09, k010, k011, k012, k013   }, \
+  { k10,   k11, k12, k13, k14, k15, k16,   k17, k18,   k19, k110, k111, k112, k113   }, \
+  { k20,   k21, k22, k23, k24, k25, k26,   k27, k28,   k29, k210, k211, k212, k213   }, \
+  { k30,   k31, k32, k33, k34, k35, k36,   k37, k38,   k39, k310, k311, k312, k313   }, \
+  { k40,   k41, k42, k43, k44, k45, KC_NO, k47, KC_NO, k49, k410, k411, k412, k413   } \
+}
+
 #define LAYOUT_ortho_hhkb( \
   k00, k01, k02, k03, k04, k05, k06, k07, k08, k09, k010, k011, k012, k013, \
   k10, k11, k12, k13, k14, k15, k16, k17, k18, k19, k110, k111, k112, k113, \