sensor: hts221: fix sensor type in Kconfig

The driver for the HTS221 sensor was added with the wrong type stated in
the Kconfig file, as it is a temperature and humidity sensor and not a
magnetometer.

Change-Id: Icc50c9b7ccc491b1c22e13d00607123a45338b11
Signed-off-by: Bogdan Davidoaia <bogdan.m.davidoaia@intel.com>