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.fr


Signed-off-by: Mark Brown <broonie@kernel.org>