virtual/kernel: update piA-AM335x kernel recipe

- better image file nameing, avoid duplication of git revision in
  version and package revision part
- AUTOREV doesn't get replaced in PKGR

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
update machine configs with current qt and rework features

- remove sgx from all current piA-AM335x machines as AAM3352 doesn't
  support it
- update QT to version 4.8.5 from oe-core
- remove screen from boards without display
- add configs for new boards

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
kernel: pia-am35x: switch branch to working one

- update 3.2.54

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
linux-ti33x-psp: switch to zImage and update defconfig

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
u-boot: add new default 2014.04 version

- add uEnv.txt

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
meta-toolchain: make sgx support optional

- shoud resolve a lot of build errors caused by the extrernal sgx
  dependencies

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
images: add mmc-utils and a default image for the apc board

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>