ci: Use Ninja with sanitycheck
ci: Use Ninja with sanitycheck

Ninja is much faster than make in the context of CI. The issues with
ninja and parallel builds has been partially resolved in sanitycheck.

Signed-off-by: Anas Nashif <0d9952ec84ac43c159f6b7e7ed99a9080c00dd6e@intel.com>

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