sanitycheck: Overcommit the default number of jobs
sanitycheck: Overcommit the default number of jobs

Overcommit the default number of jobs by factor 2
to keep the original behavior intact.

Signed-off-by: Oleg Zhurakivskyy <cdb82bfa180f8df716a77d2c2557196a597a233c@intel.com>

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