x86/time/rtc: Don't print extended CMOS year when reading RTC

We shouldn't print the current century every time we read the
RTC.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20130104224146.15189.14874.stgit@bhelgaas.mtv.corp.google.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>