get_MMIO_BAR_base_address inconsistency

Found that is_ba_invalid is not updated within 'align_bits' conditional
causing an exception when a vaild base address is found

Signed-off-by: brentholtsclaw <brent.holtsclaw@intel.com>

chipsec/hal/mmio.py

@@ -269,6 +269,7 @@ def get_MMIO_BAR_base_address(self, bar_name: str, bus: Optional[int] = None) ->
             limit += ((0x1 << int(bar['align_bits'])) - 1)
             limit += start
             size = limit - base
+            is_ba_invalid = base == 0 or is_all_ones(base, size)
         else:
             size = bar['size'] if ('size' in bar) else DEFAULT_MMIO_BAR_SIZE