net: stmmac: Minor spell fix related to 'stmmac_clk_csr_set()'

Minor spell fix related to 'stmmac_clk_csr_set()' inside a
comment used in the 'stmmac_probe_config_dt()' function.

Cc: Biao Huang <biao.huang@mediatek.com>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Link: https://lore.kernel.org/r/20220924104514.1666947-1-bhupesh.sharma@linaro.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>