PM: add p9_check_proc_config call to p9_pm_init
PM: add p9_check_proc_config call to p9_pm_init

- Added HOMER pointer to p9_pm_init as this is needed by p9_check_proc_config
- Added HOMER pointer to p9_pm_reset as this will be needed for PM FFDC in
  the future.
- Update the review comments

Change-Id: If2cd71390ce70b47a48be50e00ca7e5020710c21
Original-Change-Id: I9a797ed4da2dad6fae56e6b6e2611b40cc6215b0
Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/44647
Tested-by: Jenkins Server <8e3f934e4c44875bc48d33da3ea13d93ba9a233f@us.ibm.com>
Reviewed-by: Prem Shanker Jha <3a412e33a2e075117b5262bcf2504c145441bf2a@in.ibm.com>
Reviewed-by: RANGANATHPRASAD G. BRAHMASAMUDRA <95a9682e5bdc1ccf6e82d516bbb3db21526dc713@in.ibm.com>
Tested-by: Hostboot CI <52521565bd8ea18a2b112942dce4f4220a97c2c8@us.ibm.com>
Reviewed-by: Daniel M. Crowell <912029ca9254ac7b5854e56910561d682e1fa2d0@us.ibm.com>
Reviewed-by: Jennifer A. Stofer <ab93eca12e43608f33daa16a67357cd7b7e867ab@us.ibm.com>

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