iio: cm32181: Change cm32181 ambient light sensor driver
iio: cm32181: Change cm32181 ambient light sensor driver

Integration time of cm32181 is guessed about milliseconds.
But cm32181_read_als_it function return IIO_VAL_INT.
So fixed to return IIO_VAL_INT_PLUS_MICRO.
Next, add .write_raw_get_fmt callback function for call iio_str_to_fixpoint.

v2: cm32181_write_als_id function fixed as it was.

Cc: Kevin Tsai <ac3696a3309e8ee26b01f4c6ea913314a2070883@capellamicro.com>
Signed-off-by: Beomho Seo <ce2a41f9f009f107a073e180c26112c5c77570c4@samsung.com>
Signed-off-by: Jonathan Cameron <09f65b71b7655725897b2fd41a09a0cefe2e1ace@kernel.org>

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