regmap: split up regmap_config.use_single_rw

Split regmap_config.use_single_rw into use_single_read and
use_single_write. This change enables drivers of devices which only
support bulk operations in one direction to use the regmap_bulk_*()
functions for both directions and have their bulk operation split into
single operations only when necessary.

Update all struct regmap_config instances where use_single_rw==true to
instead set both use_single_read and use_single_write. No attempt was
made to evaluate whether it is possible to set only one of
use_single_read or use_single_write.

Signed-off-by: David Frey <dpfrey@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 49f4b33..542dc40 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -254,7 +254,8 @@ static const struct regmap_config lm75_regmap_config = {
 	.volatile_reg = lm75_is_volatile_reg,
 	.val_format_endian = REGMAP_ENDIAN_BIG,
 	.cache_type = REGCACHE_RBTREE,
-	.use_single_rw = true,
+	.use_single_read = true,
+	.use_single_write = true,
 };
 
 static void lm75_remove(void *data)