powerpc/ptdump: Display _PAGE_READ and _PAGE_WRITE

Instead of always displaying either 'rw' or 'r ' depending on
_PAGE_RW, display 'r' or ' ' for _PAGE_READ and 'w' or ' '
for _PAGE_WRITE.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/dd8201a0f8fd87ce62a7ff2edc958b604b8ec3c0.1695659959.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/ptdump/shared.c

@@ -11,10 +11,15 @@
 
 static const struct flag_info flag_array[] = {
 	{
-		.mask	= _PAGE_RW,
+		.mask	= _PAGE_READ,
 		.val	= 0,
-		.set	= "r ",
-		.clear	= "rw",
+		.set	= " ",
+		.clear	= "r",
+	}, {
+		.mask	= _PAGE_WRITE,
+		.val	= 0,
+		.set	= " ",
+		.clear	= "w",
 	}, {
 		.mask	= _PAGE_EXEC,
 		.val	= _PAGE_EXEC,