clk: shmobile: rz: Add CPG/MSTP Clock Domain support

Add Clock Domain support to the RZ Clock Pulse Generator (CPG) driver
using the generic PM Domain.  This allows to power-manage the module
clocks of SoC devices that are part of the CPG/MSTP Clock Domain using
Runtime PM, or for system suspend/resume.

SoC devices that are part of the CPG/MSTP Clock Domain and can be
power-managed through an MSTP clock should be tagged in DT with a proper
"power-domains" property.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit f04b486d

)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>