message: reduce buffer size of the uhyve nic
diff: #define MIN(a, b) (a) < (b) ? (a) : (b)
  -#define RX_BUF_LEN 8192
  -#define TX_BUF_LEN 4096
  -#define TX_BUF_NUM 4 //number of tx buffer
  +#define RX_BUF_LEN 2048
  +#define TX_BUF_LEN 2048
  +#define TX_BUF_NUM 1 //number of tx buffer
  #define UHYVE_PORT_NETINFO 0x505
  #define UHYVE_PORT_NETWRITE 0x506
  