[OE-core] [RFC PATCH 0/1] u-boot inc: update inc file for newer u-boot versions

[Chase Maupin]

All,

I would like your feedback on this patch which is intended to solve the
following issues with some of the newer versions of u-boot:

1. The u-boot image now ends in .img instead of .bin
2. Some versions and plaforms may use and SPL bootloader which is
   built at the same time as the u-boot binary

I tried to make sure this was backwards compatible and I was able to test
this for an am335x-evm machine from the meta-texasinstruments layer.

Most of these changes were ported from the u-boot.inc file that is in the
meta-texasinstruments layer and cleaned up to make them more generic.

Lastly, I noticed that the u-boot.inc file does not have any kind of
INC_PR defined like I would have expected to help make sure that updates
to this file cause a rebuild of u-boot recipes that depend on this
include file.  Is this something that should be added?

Thanks,
Chase