devices: pci: fix capability mask in status reg
devices: pci: fix capability mask in status reg

The status register is actually the high 16 bits of register index
STATUS_REG (1).  Adjust the STATUS_REG_CAPABILITIES_USED_MASK value
accordingly so it is bit 4 within the high 16 bits.

Change-Id: I3fb695a577bae754eda5640224ef335c44b119eb
Signed-off-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1208152
Reviewed-by: Dylan Reid <c791bfe44996c1eed9c7149a0c5f12a86d58eb85@chromium.org>

google/crosvm,google/crosvm,google/crosvm,google/crosvm