ptp: Make PTP_1588_CLOCK select rather than depend on PPS

PTP hardware clock drivers that select PTP_1588_CLOCK must currently
also select PPS.  For those drivers that don't, the user must enable
PPS, then enable PTP_1588_CLOCK, then the driver.  Simplify things for
developers and users by putting this selection in one place.
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/Kconfig

@@ -124,7 +124,6 @@ config IGB_PTP
 	bool "PTP Hardware Clock (PHC)"
 	default n
 	depends on IGB
-	select PPS
 	select PTP_1588_CLOCK
 	---help---
 	  Say Y here if you want to use PTP Hardware Clock (PHC) in the
@@ -226,7 +225,6 @@ config IXGBE_PTP
 	bool "PTP Clock Support"
 	default n
 	depends on IXGBE
-	select PPS
 	select PTP_1588_CLOCK
 	---help---
 	  Say Y here if you want support for 1588 Timestamping with a

drivers/net/ethernet/oki-semi/pch_gbe/Kconfig

@@ -26,7 +26,6 @@ if PCH_GBE
 config PCH_PTP
 	bool "PCH PTP clock support"
 	default n
-	select PPS
 	select PTP_1588_CLOCK
 	select PTP_1588_CLOCK_PCH
 	---help---

drivers/ptp/Kconfig

@@ -4,12 +4,9 @@
 
 menu "PTP clock support"
 
-comment "Enable Device Drivers -> PPS to see the PTP clock options."
-	depends on PPS=n
-
 config PTP_1588_CLOCK
 	tristate "PTP clock support"
-	depends on PPS
+	select PPS
 	help
 	  The IEEE 1588 standard defines a method to precisely
 	  synchronize distributed clocks over Ethernet networks. The