RTM_MP should be connected via a key
Currently RTM_MP power line is directly connected to P3V3_MP.
This doesn't work well with RTM hotplug. Plugging in RTM module may
cause MP overcurrent error in MCH
Moreover, PICMG_MTCA_4_R1 clearly states "REQ 3-5: The Front AMC‟s MMC should gate MP to the μRTM."