apm821xx: WNDR4700: remove obsolete sd-card change detection

The SD-Card polling is now implemented by default in the
fs-tools block-mount utility package. It might not be as
fast as the current detection method since the polling
time is 2 Seconds, but it's much less of an hack.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

target/linux/apm821xx/base-files/etc/rc.button/BTN_1

@@ -1,18 +0,0 @@
-#!/bin/sh
-
-. /lib/functions.sh
-
-BOARD=$(board_name)
-
-if [ $BOARD == "netgear,wndr4700" ]; then
-	case "$ACTION" in
-	released)
-		rmmod dwc2
-	;;
-	pressed)
-		modprobe dwc2
-	;;
-	esac
-fi
-
-return 0