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Add a new meta-arm-toolchain layer to hold ARM GNU-A toolset recipes
imported from meta-linaro tree, branch: master and commit ID:
504ca3b217c9602b10eda0ec8a9f1055b59e482f.

Change-Id: I5a2907874da2869ab94d7d48e0cf4a1bfe241041
Tested-by: Denys Dmytriyenko <denys@ti.com>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>