clk: axi-clkgen: Migrate to clk_hw based OF and registration APIs
Now that we have clk_hw based provider APIs to register clks, we
can get rid of struct clk pointers while registering clks in
these drivers, allowing us to move closer to a clear split of
consumer and provider clk APIs.
Cc: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>