include/boot/s390.h: Always use __vector128 from asm/types.h

asm/types.h may be included after the guard. This happens eg. when
compiling with musl libc. When including the header directly the
include is always there and the fallback __vector128 is not needed
anymore.

The guard was introduced by commit 11bdab2629 ("include/boot/s390.h:
add guard for `struct __vector128`")

Github-ID: https://github.com/ibm-s390-linux/s390-tools/pull/193
Signed-off-by: Sertonix <sertonix@posteo.net>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
[hoeppner@linux.ibm.com: Adapt commit message]
Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

include/boot/s390.h

@@ -29,6 +29,7 @@
 #define UNPACK_FACILITY		_AC(161, U)
 
 #ifndef __ASSEMBLER__
+#include <asm/types.h>
 #include <stdint.h>
 
 /*
@@ -380,18 +381,6 @@ static __always_inline int is_zvm(void)
 	return cpuid.version == 0xff;
 }
 
-/* To avoid conflicts add a macro guard since __vector128 is also
- * defined in 'linux/asm/types.h'.
- */
-#ifndef _S390_TYPES_H
-/*
- * Vector register definition
- */
-typedef struct {
-	uint32_t u[4];
-} __vector128;
-#endif
-
 /*
  * Save vector registers
  */