ARM: dts: aspeed: yamp: Delete no-hw-checksum

Ftgmac100's checksum issue has been fixed by commit 88824e3b ("net:
ethernet: ftgmac100: Fix DMA coherency issue with SW checksum") so this
property is no longer required.

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>