ARM: Exynos5: Enable platform support for SPI controllers

ARM: Exynos5: Enable platform support for SPI controllers

Add the platform bits which are required to support SPI controllers.

BUG=None
TEST=None

Change-Id: I0c10313b7b4cbe1cf856417c1fa001b2ad7f7a5d
Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Reviewed-on: https://gerrit-int.chromium.org/17935
Reviewed-by: Olof Johansson <olofj@google.com>
Tested-by: Doug Anderson <dianders@google.com>
Commit-Ready: Doug Anderson <dianders@google.com>