Replace numbers with enums

Replace numbers with enums for default target sequence level.

Change-Id: I931372789848ca6af950ecf3cd0cfac63c5bd47a

av1/av1_cx_iface.c

diff --git a/av1/av1_cx_iface.c b/av1/av1_cx_iface.c
index 80ff7d8..9fd3931 100644
--- a/av1/av1_cx_iface.c
+++ b/av1/av1_cx_iface.c
@@ -253,8 +253,13 @@
   0,  // use_intra_default_tx_only
   0,  // quant_b_adapt
   {
-      31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
-      31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31, 31,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
+      SEQ_LEVEL_MAX, SEQ_LEVEL_MAX,
   },            // target_seq_level_idx
   0,            // tier_mask
   0,            // min_cr