[U-Boot] Please separated FMan from generate NET config

[york sun]

Mingkai,

I noticed during recent debug on LS1043ARDB and LS1046ARDB that the 
general network feature is combined with DPAA FMan. This is not correct. 
The fix is easy. You only need to change the Makefile in board folder to 
build eth.o with $(CONFIG_NET) instead of $(CONFIG_SYS_DPAA_FMAN). You 
also need to adjust the board config header file to select PHY config 
with generate net option vs FMan specific ones.

Please send patches to fix them.

York