Fix WiFi on Kobo (#3891)

Regression after bdb82d09c1
TL;DR: That thing is race-y as hell.

The more I play with Kobos, the more it feels like the whole thing's
held together by pieces of fraying strings...

platform/kobo/enable-wifi.sh

@@ -5,10 +5,8 @@
 lsmod | grep -q sdio_wifi_pwr || insmod "/drivers/${PLATFORM}/wifi/sdio_wifi_pwr.ko"
 # WIFI_MODULE_PATH = /drivers/$PLATFORM/wifi/$WIFI_MODULE.ko
 lsmod | grep -q "${WIFI_MODULE}" || insmod "${WIFI_MODULE_PATH}"
-
-while [ ! -e /sys/class/net/eth0 ]; do
-    usleep 200000
-done
+# Race-y as hell, don't try to optimize this!
+sleep 1
 
 ifconfig eth0 up
 [ "$WIFI_MODULE" != "8189fs" ] && wlarm_le -i eth0 up

platform/kobo/nickel.sh

@@ -19,9 +19,10 @@ if lsmod | grep -q sdio_wifi_pwr; then
     [ "${WIFI_MODULE}" != "8189fs" ] && wlarm_le -i "${INTERFACE}" down
     ifconfig "${INTERFACE}" down
     # NOTE: Kobo's busybox build is weird. rmmod appears to be modprobe in disguise, defaulting to the -r flag. If re-specifying -r starts to fail one day, switch to rmmod without args, or modprobe -r.
-    rmmod -r "${WIFI_MODULE}"
     # c.f., #2394?
     usleep 200000
+    rmmod -r "${WIFI_MODULE}"
+    usleep 200000
     rmmod -r sdio_wifi_pwr
 fi