Add driver for the ARM Primecell Message-Handling-Unit(MHU) controller.
Signed-off-by: NJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: NAndy Green <andy.green@linaro.org>
Signed-off-by: NVincent Yang <vincent.yang@socionext.com>
Signed-off-by: NTetsuya Nuriya <nuriya.tetsuya@socionext.com>