Update linux-chromebook to 2014-01-14 snapshot.

It's been about 2.5 months since the last PKGBUILD sync to the upstream chromeos-3.4 branch.   So I went ahead and rolled the PKGBUILD forward to today.  

I don't believe this has any terribly important updates however there were some large updates to USBNET.  There are also some updates to print out charger information in the wake of Spring's charger difficulties.  https://chromium.googlesource.com/chromiumos/third_party/kernel/+log/chromeos-3.4 has all of the updates between the versions.  

The only kernel config change is the additional of module for the Samsung USB ethernet adapter.  Upstream added support and enabled it as a module so I did the same.  

I've built this and been running it on Spring without issue but it needs testing on Snow as I don't have the Samsung.