utimensat_tests: Make use of tst_kvcmp again

tst_kvercmp* binaries have been removed in:

commit 4847f1c13dabbfadd612aa812e2c99973f35f230
Author: Cyril Hrubis <chrubis@suse.cz>
Date:   Mon Nov 14 13:44:45 2016 +0100

apicmd: Get rid of tst_kvercmp* binaries.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Acked-by: Jan Stancek <jstancek@redhat.com>
diff --git a/testcases/kernel/syscalls/utimensat/utimensat_tests.sh b/testcases/kernel/syscalls/utimensat/utimensat_tests.sh
index 4ae8651..2af99f5 100755
--- a/testcases/kernel/syscalls/utimensat/utimensat_tests.sh
+++ b/testcases/kernel/syscalls/utimensat/utimensat_tests.sh
@@ -26,7 +26,7 @@
 export TST_COUNT=0
 . test.sh
 
-if tst_kvercmp 2 6 22 ; then
+if tst_kvcmp -lt "2.6.22"; then
 	tst_brkm TCONF "System kernel version is less than 2.6.22,cannot execute test"
 fi