alsa-lib: Cleanup packaging

alsa-lib: Cleanup packaging

Cleans up the packaging by moving libasound.so.2 back into the alsa-lib
package which was previously empty.

Previously, it was difficult to create an image that had libasound.so.2,
then create an SDK from that image that had the proper development
files, because the only way to get libasound.so.2 was to do:

 IMAGE_INSTALL += "libasound"

This however caused a problem because all of the development files that
would be desired in the SDK were located in alsa-lib-dev, which wouldn't
be included because alsa-lib wasn't included, and it was impossible to
include alsa-lib because it was an empty package that was culled.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>