tests: lib: cmsis_dsp: filtering: Update FIR Q15 tests for 1.9.0
tests: lib: cmsis_dsp: filtering: Update FIR Q15 tests for 1.9.0

This commit updates the filtering FIR Q15 test implementations for the
CMSIS-DSP 1.9.0.

Signed-off-by: Stephanos Ioannidis <dc76e9f0c0006e8f919e0c515c66dbba3982f785@stephanos.io>

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