perf event: Remove needless include directives from event.h

bpf.h and build-id.h are not needed at all in event.h, remove them.

And fixup the fallout of files that were getting needed stuff from this
now pruned include.

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-rdm3dgtlrndmmnlc4bafsg3b@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/callchain.h

@@ -8,6 +8,7 @@
 #include "map_symbol.h"
 #include "branch.h"
 
+struct evsel;
 struct map;
 
 #define HELP_PAD "\t\t\t\t"