x86: dts: Add compatible string for Intel ICH9 SPI controller

Add this to the enum so that we can use the various fdtdec functions. A
later commit will move this driver to driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/lib/fdtdec.c b/lib/fdtdec.c
index 487122e..e989241 100644
--- a/lib/fdtdec.c
+++ b/lib/fdtdec.c
@@ -83,6 +83,7 @@
 	COMPAT(INTEL_MODEL_206AX, "intel,model-206ax"),
 	COMPAT(INTEL_GMA, "intel,gma"),
 	COMPAT(AMS_AS3722, "ams,as3722"),
+	COMPAT(INTEL_ICH_SPI, "intel,ich-spi"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)