EDAC, pnd2: Properly toggle hidden state for P2SB PCI device

Properly handle hidden state of P2SB PCI device (DEV:D, FUN:0) for
Apollo Lake.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170814154905.21707-1-qiuxu.zhuo@intel.com


Signed-off-by: Borislav Petkov <bp@suse.de>