surface: add dfb_surface_get_data_offsets()
surface: add dfb_surface_get_data_offsets()

This can be used to calculate (and return) the pixel address and pitch
for split buffer formats, for the CbCr or Cb and Cr components (2-plane
or 3-plane formats).

Signed-off-by: André Draszik <4a4cb09e7b43b167f95b1dc166b9a7dec9f65d7c@st.com>

lancebaiyouview/DirectFB,kevleyski/directfb,lancebaiyouview/DirectFB,jcdubois/DirectFB,deniskropp/DirectFB,mtsekm/test,djbclark/directfb-core-DirectFB,kaostao/directfb,dfbdok/DirectFB1,deniskropp/DirectFB,mtsekm/test,kaostao/directfb,djbclark/directfb-core-DirectFB,sklnet/DirectFB,lancebaiyouview/DirectFB,jcdubois/DirectFB,kevleyski/directfb,kaostao/directfb,dfbdok/DirectFB1,sklnet/DirectFB,DirectFB/directfb,djbclark/directfb-core-DirectFB,djbclark/directfb-core-DirectFB,DirectFB/directfb,kevleyski/directfb,DirectFB/directfb,lancebaiyouview/DirectFB,sklnet/DirectFB,deniskropp/DirectFB,mtsekm/test,sklnet/DirectFB,deniskropp/DirectFB,jcdubois/DirectFB,dfbdok/DirectFB1,kevleyski/directfb