perf hist: Remove symbol.h from hist.h, just fwd decls are needed

To reduce the includes dependencies.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-cmvg5ght75mmfg1efeyna9rn@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/ui/gtk/annotate.c

@@ -5,6 +5,7 @@
 #include "util/annotate.h"
 #include "util/evsel.h"
 #include "util/map.h"
+#include "util/symbol.h"
 #include "ui/helpline.h"
 #include <inttypes.h>
 #include <signal.h>

tools/perf/util/auxtrace.c

@@ -41,6 +41,7 @@
 #include "pmu.h"
 #include "evsel.h"
 #include "cpumap.h"
+#include "symbol.h"
 #include "thread_map.h"
 #include "asm/bug.h"
 #include "auxtrace.h"

tools/perf/util/callchain.c

@@ -26,6 +26,7 @@
 #include "map.h"
 #include "callchain.h"
 #include "branch.h"
+#include "symbol.h"
 
 #define CALLCHAIN_PARAM_DEFAULT			\
 	.mode		= CHAIN_GRAPH_ABS,	\

tools/perf/util/hist.h

@@ -8,12 +8,13 @@
 #include "evsel.h"
 #include "header.h"
 #include "color.h"
-#include "symbol.h"
 #include "ui/progress.h"
 
 struct hist_entry;
 struct hist_entry_ops;
 struct addr_location;
+struct mem_info;
+struct branch_info;
 struct symbol;
 
 enum hist_filter {