[Pull][Utopic] EFI RTC support for arm64

[Dann Frazier]

 This patch set refactors the previously ia64-specific EFI RTC driver
to support multiple architectures and configures it =y for arm64 (=y
vs =m so that it is present when RTC_HCTOSYS inits):
  git://kernel.ubuntu.com/dannf/ubuntu-utopic-hyperscale.git@rtc-efi

The code changes are straight cherry picks. Tested in an ARM64 UEFI VM.
This is intended to resolve LP: #1441291.

 arch/ia64/kernel/time.c                   | 15 ---------------
 debian.master/config/config.common.ubuntu |  1 +
 drivers/rtc/Kconfig                       |  2 +-
 drivers/rtc/Makefile                      |  4 ++++
 drivers/rtc/rtc-efi-platform.c            | 31 +++++++++++++++++++++++++++++++
 5 files changed, 37 insertions(+), 16 deletions(-)