linux-yocto/3.4: integrate LTSI-3.4

linux-yocto/3.4: integrate LTSI-3.4

Updating the linux-yocto-3.4 SRCREVS to activate the merge of the 3.4.25-ltsi
tree:

   http://git.linuxfoundation.org/?p=ltsi-kernel.git;a=tag;h=refs/tags/v3.4.25-ltsi

The pristine patch queue can be seen on the "ltsi" branch in the repository.
This branch has been merged into the standard/base branch of linux-yocto-3.4
and to all BSP branches in the tree.

LTSI based BSPs or features are not activated as part of this commit, they
are controlled by the meta branch of the kernel repository and are activated
in separate patches.

[YOCTO #2396]

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>