Clear out interrupt register 0x40007 on mpipl path
Clear out interrupt register 0x40007 on mpipl path

In the dump path for MPIPL we were having issues where this register
was reporting a checkstop but getcfam pu 1007 was not reporting anything.
A lot of weird things get done during mpipl so I am guessing something
didnt get masked correctly.

Change-Id: Ic9102375912f49e622a63c0bac449fded22cbeaa
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/43722
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: Jenkins OP Build CI <e610bd72261d3c0a48f1e8ae36832ab00774d426@us.ibm.com>
Tested-by: Jenkins OP HW <0eb0fff262f74a65a832afbcc7b153e391c9a3fd@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Reviewed-by: Corey V. Swenson <6b585c7446d4a0351ef146912eaabcae3d9a2e28@us.ibm.com>
Reviewed-by: Martin Gloff <df0a4963746ae04ab678d064fccc7ee68adfd751@us.ibm.com>
Reviewed-by: Matt Derksen <7e9f2fc2ed13c4ee3c2ab17f188630a0f557de86@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>

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