clk: mediatek: Provide mtk_devm_alloc_clk_data

Provide a helper that replaces the kzalloc with devm_kzalloc so error
handling gets easier.

Signed-off-by: Markus Schneider-Pargmann <msp@baylibre.com>
Link: https://lore.kernel.org/r/20220822152652.3499972-3-msp@baylibre.com


Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>