RTC: Fill in missing enums for adaptive_rd_thresh speed feature

Some of the enums in a static used by adaptive_rd_thresh are
currently not filled in, which defaults them to 0 (NEARESTMV). This
incorrectly prunes out ALTREF's modes even if they are often used.

| SPD_SET | TESTSET | AVG_PSNR | OVR_PSNR |  SSIM   |  SPD  |
|---------|---------|----------|----------|---------|-------|
|    7    |   rtc   | -0.075%  | -0.115%  | -0.132% | +0.3% |
|    7    |rtc_derf | +0.023%  | +0.015%  | +0.087% | +0.2% |
|---------|---------|----------|----------|---------|-------|
|    8    |   rtc   | +0.014%  | -0.033%  | -0.028% | +0.4% |
|    8    |rtc_derf | +0.000%  | +0.000%  | +0.000% | +0.0% |

STATS_CHANGED

Change-Id: I6ddef805fedaa59061f1a148b6c2d21a291ca27e

av1/encoder/nonrd_pickmode.c

diff --git a/av1/encoder/nonrd_pickmode.c b/av1/encoder/nonrd_pickmode.c
index e3c9b8d..33a14e6 100644
--- a/av1/encoder/nonrd_pickmode.c
+++ b/av1/encoder/nonrd_pickmode.c
@@ -104,7 +104,10 @@
   { THR_NEARESTMV, THR_NEARMV, THR_GLOBALMV, THR_NEWMV },
   { THR_NEARESTL2, THR_NEARL2, THR_GLOBALL2, THR_NEWL2 },
   { THR_NEARESTL3, THR_NEARL3, THR_GLOBALL3, THR_NEWL3 },
-  { THR_NEARESTG, THR_NEARG, THR_GLOBALMV, THR_NEWG },
+  { THR_NEARESTG, THR_NEARG, THR_GLOBALG, THR_NEWG },
+  { THR_NEARESTB, THR_NEARB, THR_GLOBALB, THR_NEWB },
+  { THR_NEARESTA2, THR_NEARA2, THR_GLOBALA2, THR_NEWA2 },
+  { THR_NEARESTA, THR_NEARA, THR_GLOBALA, THR_NEWA },
 };
 
 static const PREDICTION_MODE intra_mode_list[] = { DC_PRED, V_PRED, H_PRED,