soc/intel/skylake: Don't use device_t

Use of device_t is deprecated.

Change-Id: Ifd1471a9cd76d2cea72262ed81b7071f31f7b375
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/28693
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>

src/soc/intel/skylake/include/soc/pch.h

@@ -23,7 +23,7 @@
 
 void pch_log_state(void);
 #if ENV_RAMSTAGE
-void pch_disable_devfn(device_t dev);
+void pch_disable_devfn(struct device *dev);
 #endif
 
 #endif /* _SOC_PCH_H_ */