drivers: ethernet: eth_stm32 tx_in_sem limit set to 1

tx_int_sem serves solely as a signal indicator and does not require signal
counting. Within eth_stm32_tx, the semaphore is reset each time a packet
is transmitted. Upon receiving the transmission completion signal, the
function exits. Signal counting is unnecessary. Change to a binary
semaphore.

Signed-off-by: WenBin Zhang <freey7955@gmail.com>
1 file changed