uqmi: fix variable initilization for timeout handling

Also add logging output for SIM initilization.

Signed-off-by: Florian Eckert <fe@dev.tdt.de>
(backported from 71865200c9)

package/network/utils/uqmi/files/lib/netifd/proto/qmi.sh

@@ -68,6 +68,8 @@ proto_qmi_setup() {
 		return 1
 	}
 
+	echo "Waiting for SIM initialization"
+	local uninitialized_timeout=0
 	while uqmi -s -d "$device" --get-pin-status | grep '"UIM uninitialized"' > /dev/null; do
 		[ -e "$device" ] || return 1
 		sleep 1;