iio:light:ltr501: fix regmap dependency
The use of regmap in commit 2f2c96338afc requires REGMAP_I2C to be selected, in
order to meet all dependencies.
Fixes: 2f2c96338afc ("iio: ltr501: Add regmap support.")
Signed-off-by: Hartmut Knaack <knaack.h@gmx.de>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Hartmut Knaack