perf tests: Remove needless headers for bp_account

A few headers are not needed and were introduced by copying from other
test file.  This patch removes the needless headers for the breakpoint
accounting testing.

Signed-off-by: Leo Yan <leo.yan@linaro.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Brajeswar Ghosh <brajeswar.linux@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Will Deacon <will@kernel.org>
Link: http://lore.kernel.org/lkml/20191018085531.6348-1-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/tests/bp_account.c

@@ -10,11 +10,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <sys/ioctl.h>
-#include <time.h>
 #include <fcntl.h>
-#include <signal.h>
-#include <sys/mman.h>
-#include <linux/compiler.h>
 #include <linux/hw_breakpoint.h>
 
 #include "tests.h"