drivers: eth: gmac: reduce ETH_SAM_GMAC_BUF_RX_COUNT

Now that the RX packets are limited to the RX workqueue only, we can
reduce ETH_SAM_GMAC_BUF_RX_COUNT to 12 and still be able to receive a
full Ethernet frame. This reduces the minimum NET_BUF_RX_COUNT required
by this driver to 24.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
1 file changed