rtc: nvvrs: Add ARCH_TEGRA to the NV VRS RTC driver

rtc: nvvrs: Add ARCH_TEGRA to the NV VRS RTC driver

The NV VRS RTC driver currently is only supported on the
Tegra platform so add a dep for ARCH_TEGRA and compile test
so it doesn't show up universally across all arches/platforms.

Fixes: 9d6d6b06933c8 ("rtc: nvvrs: add NVIDIA VRS RTC device driver")
Cc: Shubhi Garg <shgarg@nvidia.com>
Cc: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Link: https://patch.msgid.link/20251222035651.433603-1-pbrobinson@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>