ti-codecs-omapl138_4.00.00.00: add new recipe for omapl138 codec

ti-codecs-omapl138_4.00.00.00: add new recipe for omapl138 codec

Recipe downloads TSPA codec's from the web and packages/build them using
the configuration file from git://arago-project.org/git/projects/codec-servers.git.

Note that recipe is preparing the source after do_unpack and before do_patch -
mainly because we want to ensure that sourceipk class picks the right sources.

Signed-off-by: Brijesh Singh <bksingh@ti.com>
Signed-off-by: Denys Dmytriyenko <denis@denix.org>
Signed-off-by: Roger Monk <r-monk@ti.com>
Signed-off-by: Koen Kooi <k-kooi@ti.com>