[U-Boot] Allwinner H5 builds broken in master

[Andre Przywara]

Hi,

while testing the EMAC DT series yesterday, I realised that the current
HEAD fails to build some H5 boards, due to breaking our infamous size limit:
nanopi_neo_plus2:
u-boot.itb exceeds file size limit:
  limit:  516096 bytes
  actual: 516188 bytes
  excess: 92 bytes
orangepi_pc2:
u-boot.itb exceeds file size limit:
  limit:  516096 bytes
  actual: 516120 bytes
  excess: 24 bytes
orangepi_zero_plus2:
u-boot.itb exceeds file size limit:
  limit:  516096 bytes
  actual: 516560 bytes
  excess: 464 bytes

As you can see it's not much, but it gets slightly worse with the new
EMAC bindings. I will try to shave a KB or so off tonight, but if anyone
has ideas meanwhile, I am all ears.

Cheers,
Andre