arm64: defconfig: enable new trigger modes for leds

arm64: defconfig: enable new trigger modes for leds

BugLink: http://bugs.launchpad.net/bugs/1763040
Most development boards and devices have one or more LEDs. It is useful
during debugging if they can be wired to show different behaviours such as
disk or cpu activity or a load-average dependent heartbeat. Enable panic
and disk activity triggers so they can be tied to LED activity during
debugging as well.

Signed-off-by: Amit Kucheria <amit.kucheria@linaro.org>
Signed-off-by: Nicolas Dechesne <nicolas.dechesne@linaro.org>
(cherry picked from commit cf473151158b4480420068365fd320a3ebd849c8
http://git.linaro.org/landing-teams/working/qualcomm/kernel.git release/qcomlt-4.14)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>