board: gateworks: venice: add additional levels for dtb name match

Gateworks produces many products from a single PCB with subloaded
components. Add an additional two levels of dtb name matching so that
for example a GW7400-A matches the dtb name of gw74xx.dtb

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/venice/eeprom.c b/board/gateworks/venice/eeprom.c
index 62b8125..282d55f 100644
--- a/board/gateworks/venice/eeprom.c
+++ b/board/gateworks/venice/eeprom.c
@@ -259,8 +259,16 @@
 			break;
 		case 2: /* don't care about PCB or BOM revision */
 			break;
+		case 3: /* don't care about last digit of model */
+			buf[strlen(buf) - 1] = 'x';
+			break;
+		case 4: /* don't care about last two digits of model */
+			buf[strlen(buf) - 1] = 'x';
+			buf[strlen(buf) - 2] = 'x';
+			break;
 		default:
 			return NULL;
+			break;
 		}
 	}