tests: disable division-by-zero test in RISC-V arch
tests: disable division-by-zero test in RISC-V arch

Because RISC-V arch (M extension) doesn't trigger exception for
division-by-zero, this test can't support RISC-V and is disabled in
RISC-V.

Signed-off-by: Jim Shu <1635390bb889c4cdee38f53a57b0915ac07d9bd9@andestech.com>

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