media: em28xx: Add include for struct usb_device_id

media: em28xx: Add include for struct usb_device_id

Traditionally <linux/mod_devicetable.h> was a header defining a plethora
of structs, among them struct usb_device_id. This was split now with the
objective that only the relevant bits are included.

Currently <linux/mod_devicetable.h> is transitively included in
drivers/media/usb/em28xx/em28xx.h via:

	drivers/media/usb/em28xx/em28xx.h ->
	<linux/i2c.h> ->
	<linux/acpi.h> ->
	<linux/device.h> ->
	<linux/device/driver.h> ->
	<linux/mod_devicetable.h

To keep struct usb_device_id available once <linux/device/driver.h>
stops including <linux/mod_devicetable.h>, include it the header
providing that struct explictly.

Acked-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://patch.msgid.link/e72de5b4b9f1aa77a3c19a5e698a195dfd81ae0b.1782808461.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>