stable release v2017.05.4, v2017.06.2, v2017.07.1

[Lucas Stach]

Hi all,

I've just pushed out a new set of Barebox stable releases:

v2017.05.4 and v2017.06.2:
- Fixed a bug in the i.MX6 CAAM random number generator driver, leading
to not really random numbers being returned.
- Fix for a longstanding bug where digesting of memory mappable files
will return wrong hashes.

v2017.07.1
- Same bugfixes as above
- Fixes a crash in the GPIO code when running on a non DT enabled board.
- Fixes wrong PLL setup on i.MX6, rendering USB unusable.

Regards,
Lucas