clk: imx25: make __mx25_clocks_init return void

The __mx25_clocks_init function always returns 0 and its only
caller does not check the return value. Let's remove it.

Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20230802184046.153394-3-martin@kaiser.cx


Signed-off-by: Abel Vesa <abel.vesa@linaro.org>