iio:light:ltr501: fix regmap dependency
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 <4bccb8448924141fc676c25eb657b52ee47a361d@gmx.de>
Acked-by: Daniel Baluta <f45a6396254d0683f1df8e14b691f61d753fe117@intel.com>
Signed-off-by: Jonathan Cameron <09f65b71b7655725897b2fd41a09a0cefe2e1ace@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs