clk: Export more clk-provider functions

Allow drivers to be compiled as modules by exporting more clock
provider functions.

Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

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