Fix 'Makefile:560: keyboards/<keyboard>/rev1/rules.mk: No such file or directory' (#8042)

keyboards/ergoslab/rev1/rules.mk

@@ -0,0 +1,3 @@
+# Revision Specific Build Options
+#   change yes to no to disable
+#

keyboards/getta25/rev1/rules.mk

@@ -0,0 +1,3 @@
+# Revision Specific Build Options
+#   change yes to no to disable
+#

keyboards/treadstone48/rev1/rules.mk

@@ -0,0 +1,3 @@
+# Revision Specific Build Options
+#   change yes to no to disable
+#