Add high bit depth args to arg list

So that their usage info. will show up with --help.

Change-Id: I8542240dcc98e8be29ac63d081f5abb932627cbf
diff --git a/vpxenc.c b/vpxenc.c
index 8798e69..c61d060 100644
--- a/vpxenc.c
+++ b/vpxenc.c
@@ -454,6 +454,9 @@
   &frame_parallel_decoding, &aq_mode, &frame_periodic_boost,
   &noise_sens, &tune_content, &input_color_space,
   &min_gf_interval, &max_gf_interval,
+#if CONFIG_VP9_HIGHBITDEPTH
+  &bitdeptharg, &inbitdeptharg,
+#endif  // CONFIG_VP9_HIGHBITDEPTH
   NULL
 };
 static const int vp9_arg_ctrl_map[] = {
@@ -480,6 +483,9 @@
   &frame_parallel_decoding, &aq_mode, &frame_periodic_boost,
   &noise_sens, &tune_content, &input_color_space,
   &min_gf_interval, &max_gf_interval,
+#if CONFIG_VP9_HIGHBITDEPTH
+  &bitdeptharg, &inbitdeptharg,
+#endif  // CONFIG_VP9_HIGHBITDEPTH
   NULL
 };
 static const int vp10_arg_ctrl_map[] = {