lib/string_choices: Add str_write_read() helper

Add an inversed variant of str_read_write(), i.e. str_write_read().
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230703185222.50554-2-andriy.shevchenko@linux.intel.comSigned-off-by: Benjamin Tissoires <bentiss@kernel.org>

include/linux/string_choices.h

@@ -30,6 +30,7 @@ static inline const char *str_read_write(bool v)
 {
 	return v ? "read" : "write";
 }
+#define str_write_read(v)		str_read_write(!(v))
 
 static inline const char *str_on_off(bool v)
 {