layer.conf: set LAYERDEPENDS
layer.conf: set LAYERDEPENDS

meta-qcom depends only oe-core, mark it explicitely. The layer has
additional dependencies on meta-oe or meta-networking, but they are
optional.

Signed-off-by: Nicolas Dechesne <05fca36dfcf68f7e1c9eaf62b074676ab50a133b@linaro.org>

ndechesne/meta-qcom,ndechesne/meta-qcom,ndechesne/meta-qcom