s390/vdso/data: Drop unnecessary header include

vdso/datapage.h includes the architecture specific vdso/data.h header
file. So there is no need to do it also the other way round and including
the generic vdso/datapage.h header file inside the architecture specific
data.h header file.

Signed-off-by: Anna-Maria Behnsen <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Vincenzo Frascino <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Acked-by: Heiko Carstens <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/s390/include/asm/vdso/data.h

···
 #define __S390_ASM_VDSO_DATA_H
 
 #include <linux/types.h>
-#include <vdso/datapage.h>
 
 struct arch_vdso_data {
 	__s64 tod_steering_delta;