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Simplify vp9_frame_type_qdelta()

Make direct use of frame type in the available VP9_COMMON structure.
Eliminate the need to map through rf_level to fetch the frame type.
This change doesn't alter the coding stats. It simplifies the
vp9_frame_type_qdelta() function logic and removes unnecessary
reference to rf_level.

Change-Id: I1a7b2f5abcae39aa4a60d08a6011dde38ecf3b58

--- a/vp9/encoder/vp9_ratectrl.c

+++ b/vp9/encoder/vp9_ratectrl.c

@@ -1188,13 +1188,10 @@

     1.75,  // GF_ARF_STD

     2.00,  // KF_STD

   };

-  static const FRAME_TYPE frame_type[RATE_FACTOR_LEVELS] = {

-    INTER_FRAME, INTER_FRAME, INTER_FRAME, INTER_FRAME, KEY_FRAME

-  };

   const VP9_COMMON *const cm = &cpi->common;

-  int qdelta =

-      vp9_compute_qdelta_by_rate(&cpi->rc, frame_type[rf_level], q,

-                                 rate_factor_deltas[rf_level], cm->bit_depth);

+

+  int qdelta = vp9_compute_qdelta_by_rate(

+      &cpi->rc, cm->frame_type, q, rate_factor_deltas[rf_level], cm->bit_depth);

   return qdelta;

 }