locks: Update lockfile dir to be FHS 3.0 compliant
locks: Update lockfile dir to be FHS 3.0 compliant

The Filesystem Hierarchy Standard version 3.0* specifies that /run
should be used for runtime variables such as locks.

The rationale for switching to use /run instead of /var/run was
because /var might not be available at early boot. Since /run is
implemented as a tmpfs and doesn't require /var to be mounted first
it can be made available earlier.

*http://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch03s15.html

BUG=chromium:591366
BRANCH=none
TEST=none

Change-Id: Ic0b5ff336c1c258db8891c0a17c836497d9793c5
Signed-off-by: David Hendricks <3b0deacc4b5357f519084f1ea34bd42bf5d34545@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/330123
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec