Revert "sensors: lis3mdl: provide name to Kconfig choice"
Revert "sensors: lis3mdl: provide name to Kconfig choice"

This reverts commit 2e20f49167c09c7ffe6567395d40ac72bd88bd0b.

"choice" section in board Kconfig.default introduces a dependency
from the sensor to the board. Then a warning was generated
whenever the sensor is used on another board

Signed-off-by: Erwan Gouriou <de4d967452b83bb0e37525652734e7d9163b6a4c@linaro.org>

finikorg/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,finikorg/zephyr,nashif/zephyr,kraj/zephyr,Vudentz/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,finikorg/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,mbolivar/zephyr,galak/zephyr,nashif/zephyr,kraj/zephyr,galak/zephyr,mbolivar/zephyr,ldts/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,ldts/zephyr,mbolivar/zephyr,punitvara/zephyr,punitvara/zephyr,explora26/zephyr,zephyriot/zephyr,punitvara/zephyr,ldts/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,zephyriot/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,punitvara/zephyr,zephyriot/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,ldts/zephyr,galak/zephyr,punitvara/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,Vudentz/zephyr,kraj/zephyr,kraj/zephyr,explora26/zephyr,galak/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,zephyriot/zephyr