net: enetc: remove unnecessary CONFIG_FSL_ENETC_PTP_CLOCK check

net: enetc: remove unnecessary CONFIG_FSL_ENETC_PTP_CLOCK check

The ENETC_F_RX_TSTAMP flag of priv->active_offloads can only be set when
CONFIG_FSL_ENETC_PTP_CLOCK is enabled. Similarly, rx_ring->ext_en can
only be set when CONFIG_FSL_ENETC_PTP_CLOCK is enabled as well. So it is
safe to remove unnecessary CONFIG_FSL_ENETC_PTP_CLOCK check.

Signed-off-by: Wei Fang <wei.fang@nxp.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20250829050615.1247468-12-wei.fang@nxp.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>