ARM: sa1100: clean up clock support

Add rtc clock support and clean clock support for gpio.

Signed-off-by: Jett.Zhou <jtzhou@marvell.com>
signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a48aecc..6e40039 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -754,7 +754,7 @@
 	select ARCH_HAS_CPUFREQ
 	select CPU_FREQ
 	select GENERIC_CLOCKEVENTS
-	select HAVE_CLK
+	select CLKDEV_LOOKUP
 	select HAVE_SCHED_CLOCK
 	select TICK_ONESHOT
 	select ARCH_REQUIRE_GPIOLIB