linux-3.4: update to 3.4.90

This fixes an issue with systemd >= 213, where it can't mount a
filesystem in /sys/fs/cgroups/systemd because sysfs didn't support
xattr.

Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
linux-3.4: add cgroup xattr patch

This should have been part of the previous commit.

Acquired from Arch Linux.

Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca>
Merge pull request #65 from SaskatoonTechworks/systemd

linux-3.4: update to 3.4.90