bitbake: toaster: add Font Awesome license

Font Awesome fonts are bundled with the Toaster UI and are released
under the SIL Open Font License 1.1.  This patch adds that information
to the LICENSE file.

(Bitbake rev: f8f387de57b46c848e6521a5f6b08742403d4797)

Signed-off-by: bavery <brian.avery@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/LICENSE

@@ -13,3 +13,5 @@ Foundation and individual contributors.
 * jsrender is redistributed under the MIT license.
 
 * QUnit is redistributed under the MIT license.
+
+* Font Awesome fonts redistributed under the SIL Open Font License 1.1