drm/i915/bios: amend child device config parameters

/* This one contains field offsets that are known to be common for all BDB

 * versions. Notice that the meaning of the contents contents may still change,

 * but at least the offsets are consistent. */

struct common_child_dev_config {

	u16 handle;

	u16 device_type;

	u8 not_common1[12];

	u8 i2c_speed;

	u8 dp_onboard_redriver;					/* 158 */

	u8 dp_ondock_redriver;					/* 158 */

	u8 hdmi_level_shifter_value:4;				/* 169 */

	u8 hdmi_max_data_rate:4;				/* 204 */

	u16 dtd_buf_ptr;					/* 161 */

	u8 edidless_efp:1;					/* 161 */

	u8 compression_enable:1;				/* 198 */

	u8 compression_method:1;				/* 198 */

	u8 ganged_edp:1;					/* 202 */

	u8 reserved0:4;

	u8 compression_structure_index:4;			/* 198 */

	u8 reserved1:4;

	u8 slave_port;						/* 202 */

	u8 reserved2;

	u16 addin_offset;

	u8 dvo_port;

	u8 not_common2[2];

	u8 i2c_pin;

	u8 slave_addr;

	u8 ddc_pin;

	u16 edid_ptr;

	u8 dvo_cfg; /* See DEVICE_CFG_* above */

	u8 tmds_support:1;

	u8 support_reserved:5;

	u8 aux_channel;

	u8 not_common3[11];

	u8 dongle_detect;

	u8 capabilities;

	u8 dvo_wiring; /* See DEVICE_WIRE_* above */

	u8 mipi_bridge_type;					/* 171 */

	u16 extended_type;

	u8 dvo_function;

	u8 flags2;						/* 195 */

	u8 dp_gpio_index;					/* 195 */

	u16 dp_gpio_pin_num;					/* 195 */

	u8 iboost_level;

} __packed;