clk: shmobile: Add MSTP clock support

MSTP clocks are gate clocks controlled through a register that handles
up to 32 clocks. The register is often sparsely populated.

Those clocks are found on Renesas ARM SoCs.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

diff --cc Documentation/devicetree/bindings/clock/renesas,cpg-mstp-clocks.txt
Simple merge

diff --cc drivers/clk/shmobile/Makefile
Simple merge

diff --cc drivers/clk/shmobile/clk-mstp.c
Simple merge