powerpc/ps3: Use str_write_read() in ps3_notification_read_write()

Remove hard-coded strings by using the str_write_read() helper function.

Suggested-by: Christophe Leroy <[e-mail]>
Signed-off-by: Thorsten Blum <[e-mail]>
Reviewed-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Madhavan Srinivasan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

arch/powerpc/platforms/ps3/device-init.c

···
 #include <linux/slab.h>
 #include <linux/reboot.h>
 #include <linux/rcuwait.h>
+#include <linux/string_choices.h>
 
 #include <asm/firmware.h>
 #include <asm/lv1call.h>
···
 static int ps3_notification_read_write(struct ps3_notification_device *dev,
 				       u64 lpar, int write)
 {
-	const char *op = write ? "write" : "read";
+	const char *op = str_write_read(write);
 	unsigned long flags;
 	int res;