modules: cmsis-dsp: Support compiling on native posix
modules: cmsis-dsp: Support compiling on native posix

Support compiling cmsis-dsp on native posix
architectures, as cmsis-dsp allows that.

Signed-off-by: Shlomi Vaknin <54c0a9b681c5459019f43c3dc65e0278ef9673d9@gmail.com>

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