Fix keylayouts to use BACK instead of incorrect BUTTON_BACK.

Fix duplicate keys in a couple of the onza controllers.  Also, add them to the
Makefile so they actually get included in the build.

Bug: 8292749
Change-Id: I8246155f84d0c3c75b21e37fb579227fda76e197
diff --git a/data/keyboards/Vendor_045e_Product_028e.kl b/data/keyboards/Vendor_045e_Product_028e.kl
index ca6fa59..301601a 100644
--- a/data/keyboards/Vendor_045e_Product_028e.kl
+++ b/data/keyboards/Vendor_045e_Product_028e.kl
@@ -22,9 +22,9 @@
 key 308   BUTTON_Y
 key 310   BUTTON_L1
 key 311   BUTTON_R1
-key 314   BUTTON_BACK
+key 314   BACK
 key 315   BUTTON_START
-key 316   BUTTON_HOME
+key 316   HOME
 key 317   BUTTON_THUMBL
 key 318   BUTTON_THUMBR