ARM: iop: convert sched_clock() to use new infrastructure

Convert iop platforms to use the new sched_clock() infrastructure for
extending 32bit counters to full 64-bit nanoseconds.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d5bd266..58e2fe3 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -992,6 +992,7 @@
 config PLAT_IOP
 	bool
 	select GENERIC_CLOCKEVENTS
+	select HAVE_SCHED_CLOCK
 
 config PLAT_ORION
 	bool