EDAC, pnd2: Mask off the lower four bits of a BAR

EDAC, pnd2: Mask off the lower four bits of a BAR

Bit[0] of BAR is always zero. Bit[2:1] and bit[3] of BAR contain the
information of 'type' and the 'prefetchable' accordingly. Therefore,
mask the lower four bits to retrieve the actual base address of a BAR.

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/20170814154813.21619-1-qiuxu.zhuo@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>