[PULL REQ][Trusty SRU] Add X-Gene GPIO driver

[Dann Frazier]

This pull request adds the xgene-gpio driver. This driver is not yet
merged into linux-next, but it has been through a few rounds of review
and the last round of comments suggest it is nearly there:
  http://www.spinics.net/lists/linux-gpio/msg01063.html

    git://kernel.ubuntu.com/dannf/trusty-xgene.git for-ubuntu-20140626

---
 Documentation/devicetree/bindings/gpio/gpio-xgene.txt |   20 +
 arch/arm64/boot/dts/apm-storm.dtsi                    |    7
 debian.master/config/config.common.ubuntu             |    1
 drivers/gpio/Kconfig                                  |    9
 drivers/gpio/Makefile                                 |    1
 drivers/gpio/gpio-xgene.c                             |  252 ++++++++++++++++++
 6 files changed, 290 insertions(+)