README: mention which meta-openembedded layers are needed
README: mention which meta-openembedded layers are needed

* meta-oe is needed for various items (mostly for Qtopia apps)
* meta-networking is needed for ntp

Signed-off-by: Paul Eggleton <737d4dae46a541673d7bf4e0d5b32714b16528d8@linux.intel.com>

bluelightning/meta-opie,bluelightning/meta-opie,bluelightning/meta-opie,bluelightning/meta-opie,bluelightning/meta-opie