linux-qoriq-sdk-headers: add new recipe (copied from FSL SDK v1.5)

Some Freescale SoC specific applications e.g. skmm-ep require header
files that are only available through linux-qoriq-sdk-headers. So
adding this recipe to allow successful compilation of such
applications.

Signed-off-by: Fahad Arslan <fahad_arslan@mentor.com>