board: starfive: spl: strip off 'starfive/' prefix

The configuration descriptions generated by binman contain the vendor
device-tree directory. Instead of adding it to all match strings just strip
it off.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/board/starfive/visionfive2/spl.c b/board/starfive/visionfive2/spl.c
index 1538d6a..13a4893 100644
--- a/board/starfive/visionfive2/spl.c
+++ b/board/starfive/visionfive2/spl.c
@@ -121,6 +121,10 @@
 
 	product_id = get_product_id_from_eeprom();
 
+	/* Strip off prefix */
+	if (strncmp(name, "starfive/", 9))
+		return -EINVAL;
+	name += 9;
 	if (!strncmp(product_id, "VF7110", 6)) {
 		version = get_pcb_revision_from_eeprom();
 		if ((version == 'b' || version == 'B') &&