cirrus: simplify bitblt BAR access functions Make use of the memory API's ability to satisfy multi-byte accesses via multiple single-byte accesses. Reviewed-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>