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Limit Max GF boost for slide shows

Set an upper limit on the maximum boost for a static
GF only group such as in slide shows as part of tweaks
to quality / rate trade off.

Change-Id: Ic72575328419cdcf82ad3a20a1d9b947538c25c6

--- a/vp9/encoder/vp9_firstpass.c

+++ b/vp9/encoder/vp9_firstpass.c

@@ -2714,6 +2714,7 @@

 #define ARF_DECAY_BREAKOUT 0.10

 #define ARF_ABS_ZOOM_THRESH 4.0

+#define MAX_GF_BOOST 5400

 static void define_gf_group(VP9_COMP *cpi, FIRSTPASS_STATS *this_frame) {

   VP9_COMMON *const cm = &cpi->common;

   RATE_CONTROL *const rc = &cpi->rc;

@@ -2932,7 +2933,7 @@

             ? 1

             : 0;

   } else {

-    rc->gfu_boost = calc_arf_boost(cpi, 0, (i - 1));

+    rc->gfu_boost = VPXMIN(MAX_GF_BOOST, calc_arf_boost(cpi, 0, (i - 1)));

     rc->source_alt_ref_pending = 0;

   }