occ: Fix hostboot-binaries dependency

Signed-off-by: Stewart Smith <stewart@linux.ibm.com>
diff --git a/openpower/package/occ/Config.in b/openpower/package/occ/Config.in
index 1d77dff..a71f25d 100644
--- a/openpower/package/occ/Config.in
+++ b/openpower/package/occ/Config.in
@@ -13,6 +13,7 @@
 config BR2_OCC_GPU_BIN_BUILD
         bool "Enables Compilation of GPU Binary Image"
         default n
+        select BR2_PACKAGE_HOSTBOOT_BINARIES
         help
             Boolean used to flag whether to compile OCC GPU binary