brcm63xx: fix lzma loader for BCM6362

BCM6362 and BCM3380 seem to share the same PRID. Disable serial output
for them until we can find a way to tell them apart reliably.

Fixes: 8f3cfe4ba2 ("brcm63xx: lzma-loader: add BCM3380 support")
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/image/lzma-loader/src/board.c

@@ -71,7 +71,7 @@ void board_init(void)
 		if ((prid & 0xff) == 0x04)
 			chipid_reg = 0xfff8c000;
 		else if ((prid & 0xff) == 0x70)
-			chipid_reg = 0xb4e00000;
+			return;	/* FIXME: 0002a070 can be 6362 and 3380 */
 		else if ((prid & 0xff) >= 0x30)
 			chipid_reg = 0xb0000000;
 		else