tests: benchmarks: Fix incorrect ARM arch variant check

Currently, the Cortex-M SysTick-based timing info implementation is
incorrectly specified for all 32-bit ARM architectures.

This commit fixes that by restricting the SysTick-based implementation
to the ARM Cortex-M architectures only; in addition, it removes the
ARM64 timing info implementation as it is identical to the default
generic implementation and was previously added only as a workaround
for the aforementioned problem.

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
2 files changed