Add systemd units for new phosphor-multi-gpio-monitor

Also added sample phosphor-multi-gpio-monitor.json for
configuration of list of GPIO to be monitored. Platform
specific file can

Add systemd units for new phosphor-multi-gpio-monitor

Also added sample phosphor-multi-gpio-monitor.json for
configuration of list of GPIO to be monitored. Platform
specific file can be added through bbappend file.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Change-Id: I3a2fac155be4583aeee52f018da6be0b506633fd

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