x86: don't shift data addresses between builds
x86: don't shift data addresses between builds

Inserting the IDT results in any data afterwards being shifted.
We want the memory addresses between the zephyr_prebuilt.elf
and zephyr.elf to be as close as possible. Insert some dummy
data in the linker script the same size as the gen_idt data
structures. Needed for forthcoming patches which generate MMU
page tables at build time.

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

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