soc: intel_s1000: add I/O mux definitions
soc: intel_s1000: add I/O mux definitions

Added I/O mux selection definitions in order to use with a pinmux driver

Signed-off-by: Sathish Kuttan <88b3ab91bbfd8c103d682ea5f9059cf275a3b834@intel.com>

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