perf tools: Remove unused xyarray.c as it was moved to tools/lib/perf

Migrated to libperf in:

  4b247fa7 ("libperf: Adopt xyarray class from perf")
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210212043803.365993-1-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/xyarray.c

-// SPDX-License-Identifier: GPL-2.0
-#include "xyarray.h"
-#include <stdlib.h>
-#include <string.h>
-#include <linux/zalloc.h>
-
-struct xyarray *xyarray__new(int xlen, int ylen, size_t entry_size)
-{
-	size_t row_size = ylen * entry_size;
-	struct xyarray *xy = zalloc(sizeof(*xy) + xlen * row_size);
-
-	if (xy != NULL) {
-		xy->entry_size = entry_size;
-		xy->row_size   = row_size;
-		xy->entries    = xlen * ylen;
-		xy->max_x      = xlen;
-		xy->max_y      = ylen;
-	}
-
-	return xy;
-}
-
-void xyarray__reset(struct xyarray *xy)
-{
-	size_t n = xy->entries * xy->entry_size;
-
-	memset(xy->contents, 0, n);
-}
-
-void xyarray__delete(struct xyarray *xy)
-{
-	free(xy);
-}