[Buildroot] Patch: new board Socrates Cyclone 5

["Michał Łyszczek" <michal.lyszczek@gmail.com>]

Hi,

This is my first contribution so please correct me if I did something wrong.

I attach patch with new board support - EVB SoCrates based on Altera's
Cyclone 5. I had to add a single binary file - preloader.bin. This is
uboot based SPL from Altera. Problem with altera is that boot images
must be signed with mkpimage tool, that is bundled with Quartus and it
is not possible to sign SPL from buildroot. Yes, supposedly there is
option in config to create signed SPL, but it doesn't work for none of
my Altera's board, hence this binary SPL. Good side is that this SPL
loads uboot that is made during compilation, so there is still place for
customization and patching if someone needs it.

-- 
Best Regards
?yszczek Micha?
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