RTC subsystem, ARM cleanup

This patch removes from the ARM subsytem some of the rtc-related functions that have been included in the RTC subsystem.

ARM Kconfig is modified to include the RTC subsystem.

--

 arch/arm/Kconfig          |    2 
 arch/arm/common/rtctime.c |  107 +++++-----------------------------------------
 2 files changed, 14 insertions(+), 95 deletions(-)

@@ -750,6 +750,8 @@ source "drivers/usb/Kconfig"
 
 source "drivers/mmc/Kconfig"
 
+source "drivers/rtc/Kconfig"
+
 endmenu
 
 source "fs/Kconfig"