Add a directory common/custom-licenses to store license texts of recipes
in meta-intel layer using custom licenses.

Adding these licenses text for emgd-driver-bin recipe:
- Intel-software-license-emgd-1.14
- Intel-user-space-graphics-driver-binary-license-emgd-1.14

This takes care of this build warning:
WARNING: emgd-driver-bin: No generic license file exists for: Intel-binary-only in any provider

This addresses one of the issue reported in the bug:
[YOCTO #3238]

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>