- add more targets for building with buildman:
  - avr32
  - m68k

and while at it, sort the list alphabetical

Reviewed-by: Roger Meier <r.meier@siemens.com>
Signed-off-by: Heiko Schocher <hs@denx.de>

- adapt to build with eldk-5.4
- add more targets for building with buildman:
  - freescale -x arm,m68k,aarch64
  - arm1136
  - arm1176
  - arm720t
  - arm920t
  - davinci
  - kirkwood

Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Roger Meier <r.meier@siemens.com>

remove powerpc 824x build, as this architecture not longer
exists.

Signed-off-by: Heiko Schocher <hs@denx.de>

Goal:
  - building all variants of U-Boot with multiple configurations
  - code quality checks and metrics
  - https://travis-ci.org/u-boot/u-boot/builds