hw/block/pflash_cfi02: Fix command address comparison

hw/block/pflash_cfi02: Fix command address comparison

Most AMD commands only examine 11 bits of the address. This masks the
addresses used in the comparison to 11 bits. The exceptions are word or
sector addresses which use offset directly rather than the shifted
offset, boff.

Signed-off-by: Stephen Checkoway <stephen.checkoway@oberlin.edu>
Message-Id: <20190426162624.55977-4-stephen.checkoway@oberlin.edu>
Acked-by: Thomas Huth <thuth@redhat.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>