[S390] Get rid of cpuid.h header file.

Merge cpuid.h header file into cpu.h.
While at it convert from typedef to struct declaration and also
convert cio code to use proper lowcore structure instead of casts.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/char/zcore.c b/drivers/s390/char/zcore.c
index 1bbae43..c431198 100644
--- a/drivers/s390/char/zcore.c
+++ b/drivers/s390/char/zcore.c
@@ -275,7 +275,7 @@
 	u32 num_pages;
 	u32 pad1;
 	u64 tod;
-	cpuid_t cpu_id;
+	struct cpuid cpu_id;
 	u32 arch_id;
 	u32 volnr;
 	u32 build_arch;