packagegroup-base: remove alsa-utils from packagegroup

After the new IMAGE_FEATURES based implementation for
adding alsa bits, this change is redundant now. Hence
removing.

Signed-off-by: Yasir-Khan <yasir_khan@mentor.com>
console-image/core-image-sato: add audio feature

Added "tools-audio" to the IMAGE_FEATURES for console-image
and core-image-sato.

Signed-off-by: Yasir-Khan <yasir_khan@mentor.com>
Merge pull request #348 from Yasir-Khan/audio-minnow

alsa support for minnow