mpc85xx: fix TL-WDR4900 v1 compatible string

Use the vendor as it is listed in vendor.txt. Use a standard lower case
compatible string.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/mpc85xx/files/arch/powerpc/boot/dts/tl-wdr4900-v1.dts

@@ -13,7 +13,7 @@
 
 / {
 	model = "TP-Link TL-WDR4900 v1";
-	compatible = "tp-link,TL-WDR4900v1";
+	compatible = "tplink,tl-wdr4900-v1";
 
 	chosen {
 		bootargs = "console=ttyS0,115200";

target/linux/mpc85xx/files/arch/powerpc/platforms/85xx/tl_wdr4900_v1.c

@@ -124,7 +124,7 @@ static int __init tl_wdr4900_v1_probe(void)
 {
 	unsigned long root = of_get_flat_dt_root();
 
-	if (of_flat_dt_is_compatible(root, "tp-link,TL-WDR4900v1"))
+	if (of_flat_dt_is_compatible(root, "tplink,tl-wdr4900-v1"))
 		return 1;
 
 	return 0;