arm: move app data before kernel data
arm: move app data before kernel data

This is a simpler memory arrangement; RAM will start with
app data, and everything after it is either kernel data or
unclaimed memory reserved for the kernel's use.

New linker variables are also implemented here.

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

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