MIPS: BCM47XX: Add Belkin F7Dxxxx board detection

Add a few Belkin F7Dxxxx entries, with F7D4401 sourced from online
documentation and the "F7D7302" being observed. F7D3301, F7D3302, and
F7D4302 are reasonable guesses which are unlikely to cause
mis-detection.

Signed-off-by: Cody P Schafer <devel@codyps.com>
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Cc: linux-mips@linux-mips.org
Cc: zajec5@gmail.com
Cc: Cody P Schafer <devel@codyps.com>
Patchwork: https://patchwork.linux-mips.org/patch/6594/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/bcm47xx/buttons.c b/arch/mips/bcm47xx/buttons.c
index f165887..49a1ce0 100644
--- a/arch/mips/bcm47xx/buttons.c
+++ b/arch/mips/bcm47xx/buttons.c
@@ -420,7 +420,11 @@
 		err = bcm47xx_copy_bdata(bcm47xx_buttons_asus_wlhdd);
 		break;
 
+	case BCM47XX_BOARD_BELKIN_F7D3301:
+	case BCM47XX_BOARD_BELKIN_F7D3302:
 	case BCM47XX_BOARD_BELKIN_F7D4301:
+	case BCM47XX_BOARD_BELKIN_F7D4302:
+	case BCM47XX_BOARD_BELKIN_F7D4401:
 		err = bcm47xx_copy_bdata(bcm47xx_buttons_belkin_f7d4301);
 		break;