clk: axi-clkgen: move the OF table at the bottom of the file

clk: axi-clkgen: move the OF table at the bottom of the file

The change is mostly cosmetic. No functional changes.
Since the driver now uses of_device_get_match_data() to obtain some driver
specific info, there is no need to define the OF table before the probe
function.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Link: https://lore.kernel.org/r/20201203074037.26940-2-alexandru.ardelean@analog.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>