platform/x86: int3472: Add include defining struct dmi_system_id

platform/x86: int3472: Add include defining struct dmi_system_id

Currently <linux/mod_devicetable.h> is included transitively in
int3472.h via

	<linux/clk-provider.h> ->
	<linux/of.h> ->
	<linux/mod_devicetable.h>

However these includes will be tightend such that only the bits relevant
for of will be provided by <linux/of.h>. To ensure that dmi_system_id
stays around, include the respective header explicitly.

Acked-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://patch.msgid.link/0ba52730f67dc995d9d896b81fa6a7320bf8cb4b.1782808461.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>