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Signed-off-by: Alejandro Mery <amery@geeks.cl>

closes #16

The stubs is only needed because we are using objects from a full
SPL build. Even these will go away when felboot is integrated in
u-boot, reducing it to only a link script and config changes.

as expected there was no problem to use sunxi_board_init directly
from u-boot. Failure on A13 was a timing issue in the host side
script (need to wait for DRAM init to finish before trying next
fel operation)

just need to wait a little for the DRAM initialization to finish. Can't
use fel until we know it's finished or things breaks down.

For some reason cubieboard no longer works with this. a13-olinuxino do
work however. Needs further analysis.

This reverts commit de093ee7.

Conflicts:
	felboot/main.c

same code but the util_printf.c one was missing copyright attribution
and slightly hacked up.

Fix fel-gpio & pio tools

ignore user_type in android nand MBR; these can be other than 0 or 2
contrary to Allwinner's expectations
allow the user to set the user_type from the command line
(optional -- backwards compatible with existing usage