Revert "ARM: sa1100: clean up of the clock support"

This reverts commit edf3ff5bac2582b57de4e7c6569fee5d7c1c0a42.

This revert is necessary to revert the broken "RTC: sa1100:
support sa1100, pxa and mmp soc families" change.
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 24626b0..bb68e65 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -754,7 +754,7 @@
 	select ARCH_HAS_CPUFREQ
 	select CPU_FREQ
 	select GENERIC_CLOCKEVENTS
-	select CLKDEV_LOOKUP
+	select HAVE_CLK
 	select HAVE_SCHED_CLOCK
 	select TICK_ONESHOT
 	select ARCH_REQUIRE_GPIOLIB