License: Add the Open Font License

This is used by two of the font files. Add this license to permit tracking
of this. The copyright text cannot be added to the .ttf files, so put it
here.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Anatolij Gustschin <agust@denx.de>
diff --git a/Licenses/README b/Licenses/README
index 731d45c..5ad921d 100644
--- a/Licenses/README
+++ b/Licenses/README
@@ -67,4 +67,5 @@
 IBM PIBS (PowerPC Initialization and		IBM-pibs			ibm-pibs.txt
 	Boot Software) license
 ISC License					ISC		Y		isc.txt			https://spdx.org/licenses/ISC
+SIL OPEN FONT LICENSE (OFL-1.1)			OFL-1.1		Y		OFL.txt			https://spdx.org/licenses/OFL-1.1.html
 X11 License					X11				x11.txt			https://spdx.org/licenses/X11.html