regmap: Reorder fields in 'struct regmap_bus' to save some memory

Group some bool variables to reduce hole and avoid padding.
On x86_64, this shrinks the size from 136 to 128 bytes.

As an example:

$ size drivers/base/regmap/regmap-fsi.o (Before)
   text	   data	    bss	    dec	    hex	filename
   4837	    136	      0	   4973	   136d	drivers/base/regmap/regmap-fsi.o

$ size drivers/base/regmap/regmap-fsi.o (After)
   text	   data	    bss	    dec	    hex	filename
   4701	    136	      0	   4837	   12e5	drivers/base/regmap/regmap-fsi.o
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/077ca39622c8870a3ea932298a9cec34f7a8295a.1676363976.git.christophe.jaillet@wanadoo.frSigned-off-by: Mark Brown <broonie@kernel.org>

include/linux/regmap.h

@@ -520,6 +520,7 @@ typedef void (*regmap_hw_free_context)(void *context);
  *	     to perform locking. This field is ignored if custom lock/unlock
  *	     functions are used (see fields lock/unlock of
  *	     struct regmap_config).
+ * @free_on_exit: kfree this on exit of regmap
  * @write: Write operation.
  * @gather_write: Write operation with split register/value, return -ENOTSUPP
  *                if not implemented  on a given device.
@@ -548,10 +549,10 @@ typedef void (*regmap_hw_free_context)(void *context);
  *     DEFAULT, BIG is assumed.
  * @max_raw_read: Max raw read size that can be used on the bus.
  * @max_raw_write: Max raw write size that can be used on the bus.
- * @free_on_exit: kfree this on exit of regmap
  */
 struct regmap_bus {
 	bool fast_io;
+	bool free_on_exit;
 	regmap_hw_write write;
 	regmap_hw_gather_write gather_write;
 	regmap_hw_async_write async_write;
@@ -568,7 +569,6 @@ struct regmap_bus {
 	enum regmap_endian val_format_endian_default;
 	size_t max_raw_read;
 	size_t max_raw_write;
-	bool free_on_exit;
 };
 
 /*