sflist: slist-alike that stores flags
sflist: slist-alike that stores flags

This slist variant allows flags to be stored in a node
without taking up any extra space by relying on 4-byte
pointer alignment; flags are stored in the two LSBs.

Signed-off-by: Andrew Boie <aab045b28152628be6af0e556050d0381fd0a34d@intel.com>

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