pia-am335x-mmi/e2: replace _ with - in machine names

- underscores don't work well in MACHINE names when it comes to
  variable overrides
- also move kernel defconfig to generic folder, it's the same for
  all pia-am335x machines

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
pia335x-full-image: update image dependencies

- add demos to the MMI and piA-AM335x images
- add nettools for mii tool

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
packagegroup-pia-qte: move core-qte to this pg

- don't depend on ..core-qt4e as it is installing the qtdemo init script
  we don't want
- cleanup dependencies, add all optionally libs we might use on the
  target systems
- remove PR (handled automatically now)

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
remove PR from our packagegroups

- handled automatically now

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
km-mmi-image: add new image

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
powervr: bump preferred version to 5.00.00.01

- it is recommended for AM335x and works better with newer kernels

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
virtual/kernel: use AUTOREV for pia kernels

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
u-boot: add uboot class for AUTOREV

- neccessary to get AUTOINC replacement in u-boot image names

Signed-off-by: Björn Krombholz <b.krombholz@pironex.de>
remove alsa and usbgadget from pia-am335x mach features

- most boards don't have those

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