serial: convert isa to qdev Everything using standard isa I/O ports and IRQ windup is considerd being an actual isa device. That are all serial_init() users except mips_mipssim() which seems to have a non-standard IRQ windup. baud rate is fixed at 115200 now as no caller passed in something else. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>