s390/pgtable: Switch read and write softbits for puds

There is no reason for the read and write softbits to be swapped in the
puds compared to pmds. They are different only because the softbits for
puds were introduced at the same time when the softbits for pmds were
swapped.

The current implementation is not wrong per se, since the macros are
defined correctly; only the documentation does not reflect reality.

With this patch, the read and write softbits for large pmd and large
puds will have the same layout, and will match the existing
documentation.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Link: https://lore.kernel.org/r/20240429143409.49892-2-imbrenda@linux.ibm.com
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

Author: Claudio Imbrenda

arch/s390/include/asm/pgtable.h

@@ -272,8 +272,8 @@ static inline int is_module_addr(void *addr)
 #define _REGION3_ENTRY_DIRTY	0x2000	/* SW region dirty bit */
 #define _REGION3_ENTRY_YOUNG	0x1000	/* SW region young bit */
 #define _REGION3_ENTRY_LARGE	0x0400	/* RTTE-format control, large page  */
-#define _REGION3_ENTRY_READ	0x0002	/* SW region read bit */
-#define _REGION3_ENTRY_WRITE	0x0001	/* SW region write bit */
+#define _REGION3_ENTRY_WRITE	0x0002	/* SW region write bit */
+#define _REGION3_ENTRY_READ	0x0001	/* SW region read bit */
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
 #define _REGION3_ENTRY_SOFT_DIRTY 0x4000 /* SW region soft dirty bit */