linux-imx

kselftest: exclude failed TARGETS from runlist

A TARGET which failed to be built/installed should not be included in the
runlist generated inside the run_kselftest.sh script.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>