button-handler: use sdeventplus loop

Use the sdeventplus event loop so that an upcoming commit can make use
of sdeventplus timers.

Change-Id: I596ee36141f16ceb5e95078bad9fbe6a12c832a6
Signed-off-by

button-handler: use sdeventplus loop

Use the sdeventplus event loop so that an upcoming commit can make use
of sdeventplus timers.

Change-Id: I596ee36141f16ceb5e95078bad9fbe6a12c832a6
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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