selftests/bpf: Relax time_tai test for equal timestamps in tai_forward

We're observing test flakiness on an arm64 platform which might not
have timestamps as precise as x86. The test log looks like:

test_time_tai:PASS:tai_open 0 nsec
test_time_tai:PASS:test_run 0 nsec
test_time_tai:PASS:tai_ts1 0 nsec
test_time_tai:PASS:tai_ts2 0 nsec
test_time_tai:FAIL:tai_forward unexpected tai_forward: actual 1702348135471494160 <= expected 1702348135471494160
test_time_tai:PASS:tai_gettime 0 nsec
test_time_tai:PASS:tai_future_ts1 0 nsec
test_time_tai:PASS:tai_future_ts2 0 nsec
test_time_tai:PASS:tai_range_ts1 0 nsec
test_time_tai:PASS:tai_range_ts2 0 nsec
#199 time_tai:FAIL

This patch changes ASSERT_GT to ASSERT_GE in the tai_forward assertion
so that equal timestamps are permitted.

Fixes: 64e15820b987 ("selftests/bpf: Add BPF-helper test for CLOCK_TAI access")
Signed-off-by: YiFei Zhu <[e-mail]>
Signed-off-by: Andrii Nakryiko <[e-mail]>
Link: https://lore.kernel.org/bpf/[e-mail]

tools/testing/selftests/bpf/prog_tests/time_tai.c

···
 	ASSERT_NEQ(ts2, 0, "tai_ts2");
 
 	/* TAI is moving forward only */
-	ASSERT_GT(ts2, ts1, "tai_forward");
+	ASSERT_GE(ts2, ts1, "tai_forward");
 
 	/* Check for future */
 	ret = clock_gettime(CLOCK_TAI, &now_tai);