Add support for clock instances for each spi controller.
Signed-off-by: NThomas Abraham <thomas.abraham@linaro.org>
Acked-by: NJaswinder Singh <jaswinder.singh@linaro.org>
[kgene.kim@samsung.com: changed the name of clk for consensus]
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>