fw_cfg: move setting of FW_CFG_VERSION_DMA bit to fw_cfg_init1()

fw_cfg: move setting of FW_CFG_VERSION_DMA bit to fw_cfg_init1()

The setting of the FW_CFG_VERSION_DMA bit is the same across both the
TYPE_FW_CFG_MEM and TYPE_FW_CFG_IO devices, so unify the logic in
fw_cfg_init1().

Signed-off-by: Mark Cave-Ayland <[email protected]>
Reviewed-by: Laszlo Ersek <[email protected]>
Reviewed-by: Eduardo Habkost <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
Tested-by: Gabriel Somlo <[email protected]>