Coresight-cti: add support to enable/disable multiple clks and regulators

Some CTIs can go into power collapse when accessing CTI's register space,
hence require a bunch of clks and regulators to be configured. This change
add support in CIT driver to enable them when CTI is used for first time
and disable them when CTI isn't used.

Change-Id: Ia8a54cbc0f8363d19811c3a0712f5b8c23530b32
Signed-off-by: Yuanfang Zhang <zhangyuanfang@codeaurora.org>