tpl_model.c: add missing CONFIG_* checks

av1_laplace_estimate_frame_rate() is only used in tpl_model.c if
`CONFIG_BITRATE_ACCURACY=1`. In tpl_model.h it is only used by
rc_log_frame_encode_param() which is only used in a block protected by
`CONFIG_RATECTRL_LOG && CONFIG_THREE_PASS && CONFIG_BITRATE_ACCURACY`.

Bug: aomedia:3416
Change-Id: I9ec618fc3c99a280c54abd0a178c6090ef7e847c

av1/encoder/tpl_model.c

diff --git a/av1/encoder/tpl_model.c b/av1/encoder/tpl_model.c
index 901d444..202ac1f 100644
--- a/av1/encoder/tpl_model.c
+++ b/av1/encoder/tpl_model.c
@@ -2148,6 +2148,7 @@
   return r;
 }
 
+#if CONFIG_BITRATE_ACCURACY
 double av1_laplace_estimate_frame_rate(int q_index, int block_count,
                                        const double *abs_coeff_mean,
                                        int coeff_num) {
@@ -2165,6 +2166,7 @@
   est_rate *= block_count;
   return est_rate;
 }
+#endif  // CONFIG_BITRATE_ACCURACY
 
 double av1_estimate_coeff_entropy(double q_step, double b,
                                   double zero_bin_ratio, int qcoeff) {

av1/encoder/tpl_model.h

diff --git a/av1/encoder/tpl_model.h b/av1/encoder/tpl_model.h
index 44e1f32..3690671 100644
--- a/av1/encoder/tpl_model.h
+++ b/av1/encoder/tpl_model.h
@@ -519,6 +519,7 @@
  */
 double av1_laplace_entropy(double q_step, double b, double zero_bin_ratio);
 
+#if CONFIG_BITRATE_ACCURACY
 /*!\brief  Compute the frame rate using transform block stats
  *
  * Assume each position i in the transform block is of Laplace distribution
@@ -539,6 +540,7 @@
 double av1_laplace_estimate_frame_rate(int q_index, int block_count,
                                        const double *abs_coeff_mean,
                                        int coeff_num);
+#endif  // CONFIG_BITRATE_ACCURACY
 
 /*
  *!\brief Init TplTxfmStats
@@ -712,6 +714,7 @@
   rc_log->txfm_stats_list[coding_index] = *txfm_stats;
 }
 
+#if CONFIG_RATECTRL_LOG && CONFIG_THREE_PASS && CONFIG_BITRATE_ACCURACY
 static inline void rc_log_frame_encode_param(RATECTRL_LOG *rc_log,
                                              int coding_index,
                                              double qstep_ratio, int q_index,
@@ -727,6 +730,7 @@
         txfm_stats->coeff_num);
   }
 }
+#endif  // CONFIG_RATECTRL_LOG && CONFIG_THREE_PASS && CONFIG_BITRATE_ACCURACY
 
 static inline void rc_log_frame_entropy(RATECTRL_LOG *rc_log, int coding_index,
                                         double act_rate,