arch/{mips,power8}/include/arch: Don't use device_t

Use of device_t is deprecated.

Change-Id: I8790bc333caa367ef46bf80b5fecc3e90ef89ca0
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/28675
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/arch/mips/include/arch/cpu.h

@@ -30,7 +30,7 @@ struct cpu_driver {
 struct thread;
 
 struct cpu_info {
-	device_t cpu;
+	struct device *cpu;
 	unsigned long index;
 };
 

src/arch/power8/include/arch/cpu.h

@@ -29,7 +29,7 @@ struct cpu_driver {
 struct thread;
 
 struct cpu_info {
-	device_t cpu;
+	struct device *cpu;
 	unsigned long index;
 #if IS_ENABLED(CONFIG_COOP_MULTITASKING)
 	struct thread *thread;