net: lan966x: Fix when CONFIG_PTP_1588_CLOCK is compiled as module

When CONFIG_PTP_1588_CLOCK is compiled as a module, then the linking of
the lan966x fails because it can't find references to the following
functions 'ptp_clock_index', 'ptp_clock_register' and
'ptp_clock_unregister'

The fix consists in adding CONFIG_PTP_1588_CLOCK_OPTIONAL as a
dependency for the driver.

Fixes: d096459494a887 ("net: lan966x: Add support for ptp clocks")
Reported-by: kernel test robot <[e-mail]>
Signed-off-by: Horatiu Vultur <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/microchip/lan966x/Kconfig

···
 config LAN966X_SWITCH
 	tristate "Lan966x switch driver"
+	depends on PTP_1588_CLOCK_OPTIONAL
 	depends on HAS_IOMEM
 	depends on OF
 	depends on NET_SWITCHDEV