Update OCC Make Process to use GPU Binaries

  - Update hostboot_binaries to point to latest commit containing
    occ gpu gpe binary
  - Add Config variables to conditionally compile occ using gpu
    gpe binary if enabled
  - Update OCC Makefile to use config vars
diff --git a/openpower/package/occ/Config.in b/openpower/package/occ/Config.in
index 29b5eb4..1d77dff 100644
--- a/openpower/package/occ/Config.in
+++ b/openpower/package/occ/Config.in
@@ -9,3 +9,15 @@
         string "Name of OCC image file"
         help
             String used to define name of the OCC binary image file
+
+config BR2_OCC_GPU_BIN_BUILD
+        bool "Enables Compilation of GPU Binary Image"
+        default n
+        help
+            Boolean used to flag whether to compile OCC GPU binary
+
+config BR2_OCC_GPU_GPE_BIN_FILENAME
+        string "Name of OCC GPU GPE Binary file"
+        help
+            String used to define name of the OCC GPUE GPE binary image file
+