sensors: add sensor_core

Change-Id: Ic5d4f41928e9b44f7aef4d5d763a05a1f55a8bbc
sensors: import gp2a light/proximity

Change-Id: I290b460302bba9141e23a4d890890d5c6d783cd9
sensors: k3g: add gyro sensor

Change-Id: Ifa1c2519e0d2ce9930b84fa625045a2650655a7e
sensors: add k3dh

Change-Id: I563b3335cbbcd7ec4dd9f34889674a58b06782e4