Remove netcfg's unused options.

Only "netcfg" for a list of interfaces and "netcfg <interface> dhcp" still
seem to be used.

Change-Id: I9f0b580474258fa648deb5287f98d8ec5533ca6f
diff --git a/adb/adb.c b/adb/adb.c
index c939ef0..4258a01 100644
--- a/adb/adb.c
+++ b/adb/adb.c
@@ -1348,7 +1348,7 @@
     ** AID_ADB to access the USB driver
     ** AID_LOG to read system logs (adb logcat)
     ** AID_INPUT to diagnose input issues (getevent)
-    ** AID_INET to diagnose network issues (netcfg, ping)
+    ** AID_INET to diagnose network issues (ping)
     ** AID_NET_BT and AID_NET_BT_ADMIN to diagnose bluetooth (hcidump)
     ** AID_SDCARD_R to allow reading from the SD card
     ** AID_SDCARD_RW to allow writing to the SD card