[ARM] pxa: remove periodic mode emulation support

Apparantly, the generic time subsystem can accurately emulate periodic
mode via the one-shot support code, so we don't need our own periodic
emulation code anymore.  Just ensure that we build support for one shot
into the generic time subsystem.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a04f507..1be7182 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -345,6 +345,7 @@
 	select GENERIC_GPIO
 	select GENERIC_TIME
 	select GENERIC_CLOCKEVENTS
+	select TICK_ONESHOT
 	help
 	  Support for Intel/Marvell's PXA2xx/PXA3xx processor line.