The enetc driver uses ifdefs when checking whether
CONFIG_FSL_ENETC_PTP_CLOCK is enabled in a number of places. This works
if the driver is compiled in but fails if the driver is available as a
kernel module. Replace the instances of ifdef with use of the IS_ENABLED
macro, that will evaluate as true when this feature is built as a kernel
module and follows the kernel's coding style.
Signed-off-by: Martyn Welch <martyn.welch@xxxxxxxxxxxxx>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@xxxxxxxxx>