cxgb4: replace ntoh{s, l} and hton{s, l} calls with the generic byteorder

replace ntoh{s,l} and hton{s,l} calls with the generic byteorder in
cxgb4/t4_hw.c file
Signed-off-by: NHariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>