[trusty] [PULL] UBUNTU: fix no console in case of cloud environment

[Ming Lei]

In current arm64 Trusty cloud image, the 'console=' parameter
has been removed from grub config, and always resort to 'stdout'
DT property which is setup from QEMU.

Unfortunately parsing 'stdout' DT property is just merged to 3.19
kernel, so there is no console usable any more for arm64 Trusty
VM when booting via uefi/grub.

9 of 10 patches are cherry picked from 3.19 to trusty, and the
other one is backported by just dropping the dt self-test code, and
with these 10 patches, arm64 Trusty VM can be booted with console
usable via uefi/grub.

BugLink: http://bugs.launchpad.net/bugs/1438585

SRU Justification:
    Impact: no console if arm64 trusty based VM is booted from the cloud image
    Fix: backport stdout enablement patches from upstream
    Testcase: boot one arm64 trusty VM via uefi/grub

So please pull the top 10 patches from below tree/branch:

     git://kernel.ubuntu.com/git/ming/ubuntu-trusty.git  stdout_support


120c28c of: support passing console options with stdout-path
1a3d0e7 of: add optional options parameter to of_find_node_by_path()
f29d72d of: Add bindings for chosen node, stdout-path
98cbe35 of: correct of_console_check()'s return value
ecadb06 of: Enable console on serial ports specified by /chosen/stdout-path
30f9087 of: Create of_console_check() for selecting a console specified in /chos
0ac7353 of: Make of_find_node_by_path() handle /aliases
7c7e998 of: Create unlocked version of for_each_child_of_node()
651599f lib: add glibc style strchrnul() variant
f26ae5f of: Add support for ePAPR "stdout-path" property

Thanks,
Ming Lei