When Tx/Rx FIFO size is not specified in advance, the driver checks ifReviewed-by: Yanteng Si <si.yanteng@xxxxxxxxx>
the value is zero and sets the hardware capability value in functions
where that value is used.
Consolidate the check and settings into function stmmac_hw_init() and
remove redundant other statements.
If FIFO size is zero and the hardware capability also doesn't have upper
limit values, return with an error message.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>