UBUNTU: SAUCE: selftest: rtcpie: Force passing unreliable subtest

BugLink: https://bugs.launchpad.net/bugs/1814234

Since 0b63accf87, the test includes a
verification of time passage that is unstable as it is prone to
different results based on the system load.

Other investigations led to disabling this test in various other
places/projects. For example, Linaro also disabled it[1].

We have chosen to keep this test but to force its result unconditionally
successful as opposed to reverting the aforementioned commit because:
1. it keeps running the test with results and data that we can use in
   the future for any "smarter" way to deal with it - eg. statistical
   approach
2. it minimizes the maintenance burden of this patch kept in our kernel
   trees

It is worth mentioning that upstream was contacted via the mailing list
with no feedback[2]. The request was to increase the current tolerance
set at 10%.

[1] https://bugs.linaro.org/show_bug.cgi?id=3402#c9
[2] https://lore.kernel.org/lkml/a304b6f1-11db-543b-2cb3-372f34dc7697@linaro.org/

Signed-off-by: Andrei Gherzan <andrei.gherzan@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

tools/testing/selftests/timers/rtcpie.c

@@ -111,11 +111,11 @@ int main(int argc, char **argv)
 			timersub(&end, &start, &diff);
 			if (diff.tv_sec > 0 ||
 			    diff.tv_usec > ((1000000L / tmp) * 1.10)) {
-				fprintf(stderr, "\nPIE delta error: %ld.%06ld should be close to 0.%06ld\n",
+				fprintf(stderr, "\nUbuntu Testing Force Pass LP #1814234: PIE delta error: %ld.%06ld should be close to 0.%06ld\n",
 				       diff.tv_sec, diff.tv_usec,
 				       (1000000L / tmp));
 				fflush(stdout);
-				exit(-1);
+				break; // LP: #1814234
 			}
 
 			fprintf(stderr, " %d",i);