scripts: gen_relocate_app.py: add custom align size for relocation
scripts: gen_relocate_app.py: add custom align size for relocation

add custom align size for code relocation to reduce alignment memory
wasting.

Fixes: #17337.

Signed-off-by: Wentong Wu <a92ffab6ab5ff780cf36418e13a69a97399df0f5@intel.com>

galak/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,Vudentz/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,nashif/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr