binman: Add support for Intel FSP-S

This entry is used to hold an Intel FSP-S (Firmware Support Package
Silicon init) binary. Add support for this in binman.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/tools/binman/README.entries b/tools/binman/README.entries
index bce2244..0c0c967 100644
--- a/tools/binman/README.entries
+++ b/tools/binman/README.entries
@@ -444,6 +444,23 @@
 
 
 
+Entry: intel-fsp-s: Entry containing Intel Firmware Support Package (FSP) silicon init
+--------------------------------------------------------------------------------------
+
+Properties / Entry arguments:
+    - filename: Filename of file to read into entry
+
+This file contains a binary blob which is used on some devices to set up
+the silicon. U-Boot executes this code in U-Boot proper after SDRAM is
+running, so that it can make full use of memory. Documentation is typically
+not available in sufficient detail to allow U-Boot do this this itself.
+
+An example filename is 'fsp_s.bin'
+
+See README.x86 for information about x86 binary blobs.
+
+
+
 Entry: intel-ifwi: Entry containing an Intel Integrated Firmware Image (IFWI) file
 ----------------------------------------------------------------------------------