[POWERPC] todc: add support for Time-Of-Day-Clock

[POWERPC] todc: add support for Time-Of-Day-Clock

This is a resubmit with a proper subject and with all comments addressed.
Applies cleanly to powerpc.git c760d91230ab07f467cb29fb451c454773779676

Mark
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The todc code from arch/ppc supports many todc/rtc chips and is needed
in arch/powerpc.  This patch adds the todc code to arch/powerpc.

Signed-off-by: Mark A. Greer <mgreer@mvista.com>
--

 arch/powerpc/Kconfig         |    7
 arch/powerpc/sysdev/Makefile |    1
 arch/powerpc/sysdev/todc.c   |  392 ++++++++++++++++++++++++++++++++++
 include/asm-powerpc/todc.h   |  487 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 887 insertions(+)
--
Signed-off-by: Paul Mackerras <paulus@samba.org>