arch: arm: Always define ARCH stack definitions
arch: arm: Always define ARCH stack definitions

This patch always defines the ARCH_THREAD_STACK_XXX macros/functions
regardless of the MPU_STACK_GUARD usage.  Only use MPU_STACK_GUARD when
determining the minimum stack alignment.

Signed-off-by: Andy Gross <4ba87047449f5700e8758e3b1af36e94376c2fff@linaro.org>

explora26/zephyr,zephyriot/zephyr,explora26/zephyr,fbsder/zephyr,punitvara/zephyr,kraj/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,zephyriot/zephyr,runchip/zephyr-cc3220,rsalveti/zephyr,finikorg/zephyr,fbsder/zephyr,aceofall/zephyr-iotos,punitvara/zephyr,galak/zephyr,galak/zephyr,kraj/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,runchip/zephyr-cc3220,galak/zephyr,ldts/zephyr,fbsder/zephyr,zephyriot/zephyr,Vudentz/zephyr,fbsder/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos,nashif/zephyr,Vudentz/zephyr,explora26/zephyr,Vudentz/zephyr,rsalveti/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,finikorg/zephyr,runchip/zephyr-cc3220,fbsder/zephyr,runchip/zephyr-cc3220,mbolivar/zephyr,rsalveti/zephyr,runchip/zephyr-cc3220,galak/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,punitvara/zephyr,nashif/zephyr,finikorg/zephyr,rsalveti/zephyr,punitvara/zephyr,mbolivar/zephyr,nashif/zephyr,finikorg/zephyr,zephyriot/zephyr,kraj/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,rsalveti/zephyr,ldts/zephyr,nashif/zephyr,finikorg/zephyr,Vudentz/zephyr,punitvara/zephyr,zephyriot/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,ldts/zephyr,Vudentz/zephyr,kraj/zephyr