selftests: breakpoints: Skip step_after_suspend_test on systems without a wakeup capable RTC

This test puts a system into suspend state and uses CLOCK_BOOTTIME_ALARM
to wake the system up. This alarm can only wake up systems that have a
wakeup capable RTC source. On systems without such an RTC (for example,
most RISC-V boards), this test puts the system into suspend and just
hangs, requiring power cycling.

clock_getres(CLOCK_BOOTTIME_ALARM) fails with EINVAL on such systems,
so add a check based on that to skip this test on systems without a
wakeup capable RTC source.

Link: https://lore.kernel.org/r/20261002-breakpoints_rtc-v1-1-a3b6542a0fdf@oss.tenstorrent.com
Signed-off-by: Anirudh Srinivasan <asrinivasan@oss.tenstorrent.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

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