[CI]: Check rtc metric just on aarch64
[CI]: Check rtc metric just on aarch64

Signed-off-by: AlexandruCihodaru <3800a8ab3c7b331fa36771a99ce71371d2e65170@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker