net: mvpp2: Remove unneeded Kconfig dependency.

The mvpp2 is an Ethernet driver, and it implements MAC style time
stamping of PTP frames.  It has no need of the expensive option to
enable PHY time stamping.  Remove the incorrect dependency.
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/marvell/Kconfig

@@ -94,7 +94,6 @@ config MVPP2
 
 config MVPP2_PTP
 	bool "Marvell Armada 8K Enable PTP support"
-	depends on NETWORK_PHY_TIMESTAMPING
 	depends on (PTP_1588_CLOCK = y && MVPP2 = y) || \
 		   (PTP_1588_CLOCK && MVPP2 = m)