x86: chromebook_coral: fix C block comment

Fix a warning seen when compiling this dts file.

Signed-off-by: Alistair Delva <adelva@google.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

arch/x86/dts/chromebook_coral.dts

@@ -825,6 +825,7 @@
 	 * Refer to EDS-Vol2-22.3
 	 * [14:8] steps of delay for HS400, each 125ps
 	 * [6:0] steps of delay for SDR104/HS200, each 125ps
+	 */
 
 	/*
 	 * EMMC TX DATA Delay 2