arm/frdm_k64f: only leave space for security in XIP images
arm/frdm_k64f: only leave space for security in XIP images

This board needs 16 bytes to be written with a specific value when the
target boots. This is only necessary when running a XIP image which
exists around those 16 bytes.

Change-Id: Ifd26b3842f09137765d9c7d1678476bfda8a563f
Signed-off-by: Benjamin Walsh <578db18f23ec223e50c404886c947386478a464e@windriver.com>
Signed-off-by: Vlad Lungu <631a8bf50e42811a0703f7ff6d7ef403ec21ca17@windriver.com>

mbolivar/zephyr,zephyrproject-rtos/zephyr,sharronliu/zephyr,zephyrproject-rtos/zephyr,aceofall/zephyr-iotos,fractalclone/zephyr-riscv,fractalclone/zephyr-riscv,rsalveti/zephyr,tidyjiang8/zephyr-doc,runchip/zephyr-cc3200,tidyjiang8/zephyr-doc,aceofall/zephyr-iotos,holtmann/zephyr,finikorg/zephyr,jamesonwilliams/zephyr-kernel,runchip/zephyr-cc3200,mirzak/zephyr-os,punitvara/zephyr,holtmann/zephyr,32bitmicro/zephyr,runchip/zephyr-cc3220,explora26/zephyr,galak/zephyr,pklazy/zephyr,zephyriot/zephyr,runchip/zephyr-cc3200,fractalclone/zephyr-riscv,tidyjiang8/zephyr-doc,fractalclone/zephyr-riscv,ldts/zephyr,punitvara/zephyr,ldts/zephyr,zephyriot/zephyr,ldts/zephyr,holtmann/zephyr,explora26/zephyr,kraj/zephyr,erwango/zephyr,Vudentz/zephyr,kraj/zephyr,bboozzoo/zephyr,coldnew/zephyr-project-fork,tidyjiang8/zephyr-doc,bigdinotech/zephyr,mbolivar/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,bboozzoo/zephyr,explora26/zephyr,jamesonwilliams/zephyr-kernel,finikorg/zephyr,Vudentz/zephyr,jamesonwilliams/zephyr-kernel,bigdinotech/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,mbolivar/zephyr,mirzak/zephyr-os,nashif/zephyr,runchip/zephyr-cc3220,32bitmicro/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,kraj/zephyr,aceofall/zephyr-iotos,holtmann/zephyr,fbsder/zephyr,runchip/zephyr-cc3220,nashif/zephyr,zephyriot/zephyr,explora26/zephyr,zephyrproject-rtos/zephyr,rsalveti/zephyr,mirzak/zephyr-os,fbsder/zephyr,sharronliu/zephyr,bigdinotech/zephyr,fbsder/zephyr,pklazy/zephyr,ldts/zephyr,galak/zephyr,mirzak/zephyr-os,punitvara/zephyr,erwango/zephyr,coldnew/zephyr-project-fork,runchip/zephyr-cc3200,pklazy/zephyr,nashif/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyriot/zephyr,sharronliu/zephyr,kraj/zephyr,coldnew/zephyr-project-fork,aceofall/zephyr-iotos,tidyjiang8/zephyr-doc,coldnew/zephyr-project-fork,32bitmicro/zephyr,runchip/zephyr-cc3220,punitvara/zephyr,rsalveti/zephyr,jamesonwilliams/zephyr-kernel,rsalveti/zephyr,erwango/zephyr,fbsder/zephyr,bboozzoo/zephyr,kraj/zephyr,finikorg/zephyr,fractalclone/zephyr-riscv,zephyrproject-rtos/zephyr,runchip/zephyr-cc3220,bigdinotech/zephyr,runchip/zephyr-cc3200,holtmann/zephyr,explora26/zephyr,galak/zephyr,bboozzoo/zephyr,coldnew/zephyr-project-fork,finikorg/zephyr,bboozzoo/zephyr,Vudentz/zephyr,zephyriot/zephyr,pklazy/zephyr,pklazy/zephyr,Vudentz/zephyr,sharronliu/zephyr,punitvara/zephyr,fbsder/zephyr,mbolivar/zephyr,ldts/zephyr,32bitmicro/zephyr,GiulianoFranchetto/zephyr,galak/zephyr,nashif/zephyr,erwango/zephyr,bigdinotech/zephyr,jamesonwilliams/zephyr-kernel,finikorg/zephyr,mbolivar/zephyr,32bitmicro/zephyr,rsalveti/zephyr,erwango/zephyr,sharronliu/zephyr,mirzak/zephyr-os,GiulianoFranchetto/zephyr,nashif/zephyr