health-mon: remove from ibm systems

The phosphor-health-monitor package added some code recently that only
supports a mtdblock based filesystem. This causes issues with the HW CI
machine, witherspoon, documented in openbmc/phosphor-health-monitor#1.

Time permitting, IBM should come back to the phosphor-health-monitor and
figure out if it makes sense within it's products. If it does, then the
appropriate bmc_health_config.json should be created for IBM systems.

(From meta-ibm rev: 3a70e470e8ec8239e27db9b7361f568cebd5ef72)

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: I02dff59cade863d287919a01d0b1f93f67661279
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>