Add detection of ktime_get_real_ts64 vs getnstimeofday

Signed-off-by: Kozlowski Mateusz <mateusz.kozlowski@intel.com>

configure.d/1_timekeeping.conf

@@ -0,0 +1,31 @@
+#!/bin/bash
+#
+# Copyright(c) 2012-2021 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+#
+
+. $(dirname $3)/conf_framework
+
+check() {
+	cur_name=$(basename $2)
+	config_file_path=$1
+	if compile_module $cur_name "ktime_get_real_ts64(NULL)" "linux/ktime.h"
+	then
+		echo $cur_name "1" >> $config_file_path
+	else
+		echo $cur_name "2" >> $config_file_path
+    fi
+}
+
+apply() {
+    case "$1" in
+    "1")
+		add_define "CAS_GET_CURRENT_TIME(timespec) ktime_get_real_ts64(timespec)" ;;
+    "2")
+		add_define "CAS_GET_CURRENT_TIME(timespec) getnstimeofday(timespec)" ;;
+    *)
+        exit 1
+    esac
+}
+
+conf_run $@