Refix upgrade erase bug
net: tftp: fix '#' line length when receiving large files

When receiving more than TftpBlkSize * 0x10000 bytes,
lines of '####" would not wrap properly. Fix this by deleting
TftpBlockWrapOffset and making TftpBlock always a 32 bit value.

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
ksz9031: change rx_ctl/tx_ctl pad skew delay to min
nitrogen6x: wait 100 us after phy reset