pci: fix bridge control bit wmask
Bits 12 to 15 in bridge control register are reserver and must be
read-only zero, curent mask is 0xffff which makes them writeable. Fix
this up by using symbolic bit names for writeable bits instead of a
hardcoded constant.
Fix a comment w1mask -> w1cmask as well.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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