Update to last release for YOCTO (axxia) repos

Update LSI_KERNEL_TAG, LINUX_VERSION and SRCREV to build the latest
released kernels from the YOCTO (axxia) repositoy, standard/axxia/base branch:
For 3.10 - Linux 3.10.43
For 3.4 - Linux 3.4.91

Signed-off-by: Daniel Dragomir <daniel.dragomir@windriver.com>
For YOCTO (axxia) kernle repos do not copy lsi defconfigs from kernel sources

YOCTO (axxia) kernel repos use an interactiv generated .config,
don't use defconfig files from /arch/$ARCH/configs/lsi_defconfig.

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