Update to last release for LSI PUBLIC repos

Update LSI_KERNEL_TAG, LINUX_VERSION and SRCREV to build the latest
released kernels from the public repository.
For 3.10 - tag 8.8.1.30
For 3.4 - tag 7.8.1.39

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
Rename Axxia Simulation Targets for 3.10 public and private repos

For the new Device Tree for Axxia Simulation Targets, rename targets
to be able to create fit images for those new DTB (for the moment only
for LSI GitHub 3.10 repos: private and public)

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>