gve: fix probe failure if clock read fails

gve: fix probe failure if clock read fails

If timestamping is supported, GVE reads the clock during probe,
which can fail for various reasons. Previously, this failure would
abort the driver probe, rendering the device unusable. This behavior
has been observed on production GCP VMs, causing driver initialization
to fail completely.

This patch allows the driver to degrade gracefully. If gve_init_clock()
fails, it logs a warning and continues loading the driver without PTP
support.

Cc: stable@vger.kernel.org
Fixes: a479a27f4da4 ("gve: Move gve_init_clock to after AQ CONFIGURE_DEVICE_RESOURCES call")
Signed-off-by: Jordan Rhee <jordanrhee@google.com>
Reviewed-by: Shachar Raindel <shacharr@google.com>
Signed-off-by: Harshitha Ramamurthy <hramamurthy@google.com>
Link: https://patch.msgid.link/20260127010210.969823-1-hramamurthy@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>