MIPS: vdso: Use generic union vdso_data_store

There is already a generic union definition for vdso_data_store in the vdso
datapage header.

Use this definition to prevent code duplication.

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]>
Link: https://lore.kernel.org/r/[e-mail]

arch/mips/include/asm/vdso.h

···
 extern struct mips_vdso_image vdso_image_n32;
 #endif
 
-union mips_vdso_data {
-	struct vdso_data data[CS_BASES];
-	u8 page[PAGE_SIZE];
-};
-
 #endif /* __ASM_VDSO_H */

arch/mips/kernel/vdso.c

···
 #include <vdso/vsyscall.h>
 
 /* Kernel-provided data used by the VDSO. */
-static union mips_vdso_data mips_vdso_data __page_aligned_data;
+static union vdso_data_store mips_vdso_data __page_aligned_data;
 struct vdso_data *vdso_data = mips_vdso_data.data;
 
 /*