[CFL] Reduce arrays used in inspection

Merge cfl_alpha_sign_u and cfl_alpha_sign_v into cfl_alpha_sign,
where:
    cfl_alpha_sign = (cfl_alpha_sign_v << 1) + cfl_alpha_sign_u;

Change-Id: I8c491e37d23f6ef85a33a8b2f8770b7b606d8e0a
diff --git a/examples/inspect.c b/examples/inspect.c
index e54e8e4..2d8c798 100644
--- a/examples/inspect.c
+++ b/examples/inspect.c
@@ -501,10 +501,8 @@
   if (layers & CFL_LAYER) {
     buf += put_block_info(buf, NULL, "cfl_alpha_idx",
                           offsetof(insp_mi_data, cfl_alpha_idx));
-    buf += put_block_info(buf, NULL, "cfl_alpha_sign_u",
-                          offsetof(insp_mi_data, cfl_alpha_sign_u));
-    buf += put_block_info(buf, NULL, "cfl_alpha_sign_v",
-                          offsetof(insp_mi_data, cfl_alpha_sign_v));
+    buf += put_block_info(buf, NULL, "cfl_alpha_sign",
+                          offsetof(insp_mi_data, cfl_alpha_sign));
   }
 #endif
   if (layers & MOTION_VECTORS_LAYER) {