clk pointer gets cached in the driver's private data and
can be used later instead of a __clk_lookup() call.
clk provider clk_data.clks[] and we can reference
the clk pointers directly rather than using __clk_lookup()
with global names.
Signed-off-by: Elaine Zhang <zhangqing@rock-chips.com>
Change-Id: I058413a912e0eaf5bf551d2515ad55ae28709985
3151edc8a4