eth: asix88179: packet drop when receiving large fragmented packets

eth: asix88179: packet drop when receiving large fragmented packets

The ASIX 88179A drops packets when receiving fragmented packets larger
than the MTU size due to an insufficient URB buffer size. This change
synchronizes the URB buffer size with the configuration used in the
Linux kernel, resolving the packet drop issue.

To reproduce the issue, set the following configuration:
    CONFIG_IP_DEFRAG=y
    CONFIG_TFTP_BLOCKSIZE=16352

Then, run the `tftp` command. It will fail with a timeout error:

    U-Boot> tftp zero.bin
    Using ax88179_eth device
    TFTP from server 10.0.0.196; our IP address is 10.0.0.18
    Filename 'zero.bin'
    Load address: 0x10000000
    Loading: T T T T T T T T T T T
    Retry count exceeded; starting again

Signed-off-by: Khoa Hoang <admin@khoahoang.com>
Reviewed-by: Marek Vasut <marex@denx.de>