clk: Add support to dump state of all clocks into ftrace

Add clk_state event to record the state of all the clocks
into ftrace. The clock event could be triggered by using
the "trace_clocks" debugfs entry and it would dump the
current state of all clocks in ftrace logs.

Change-Id: I28b6574fe1d96472833a93e7b251dbba6c6eae49
Signed-off-by: Amit Nischal <anischal@codeaurora.org>