Added file generic_hbrt_fsp_message.H to file dist.targets.mk
Added file generic_hbrt_fsp_message.H to file dist.targets.mk

The file contains definitions for the FSP generic msg structures
that needs be shared with FSP.

Change-Id: I8651c7faf3bea9e2ec6e6b5af34b57320c56a113
RTC:171488
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/48573
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Tested-by: Jenkins OP Build CI <e610bd72261d3c0a48f1e8ae36832ab00774d426@us.ibm.com>
Tested-by: FSP CI Jenkins <aa9e4d9ac7cd25905e9c0dd36d4150516e73dd86@us.ibm.com>
Tested-by: Jenkins OP HW <0eb0fff262f74a65a832afbcc7b153e391c9a3fd@us.ibm.com>
Reviewed-by: Donald Washburn <b070285289347088b9119836d2d5854ca061dcb4@us.ibm.com>
Reviewed-by: ILYA SMIRNOV <2c7a6ec38cfb553b896499595cca9c656159f2a4@us.ibm.com>
Reviewed-by: William G. Hoffa <7dd6aa5e78423995d9d7c7ecada5b77ee07f88cc@us.ibm.com>

open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot,open-power/hostboot